/*!
 * Vue.js v2.6.14
 * (c) 2014-2021 Evan You
 * Released under the MIT License.
 */
// 匿名函数
(
  function (global, factory) {
    console.log(global);
    console.log(factory());
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
      typeof define === 'function' && define.amd ? define(factory) :
        (global = global || self, global.Vue = factory());
  }
    (
      this, function () {
        'use strict';

        /*  */

        var emptyObject = Object.freeze({});

        // These helpers produce better VM code in JS engines due to their
        // explicitness and function inlining.
        function isUndef (v) {
          return v === undefined || v === null
        }

        function isDef (v) {
          return v !== undefined && v !== null
        }

        function isTrue (v) {
          return v === true
        }

        function isFalse (v) {
          return v === false
        }

        /**
         * Check if value is primitive.
         */
        function isPrimitive (value) {
          return (
            typeof value === 'string' ||
            typeof value === 'number' ||
            // $flow-disable-line
            typeof value === 'symbol' ||
            typeof value === 'boolean'
          )
        }

        /**
         * Quick object check - this is primarily used to tell
         * Objects from primitive values when we know the value
         * is a JSON-compliant type.
         */
        function isObject (obj) {
          return obj !== null && typeof obj === 'object'
        }

        /**
         * Get the raw type string of a value, e.g., [object Object].
         */
        var _toString = Object.prototype.toString;

        function toRawType (value) {
          return _toString.call(value).slice(8, -1)
        }

        /**
         * Strict object type check. Only returns true
         * for plain JavaScript objects.
         */
        function isPlainObject (obj) {
          return _toString.call(obj) === '[object Object]'
        }

        function isRegExp (v) {
          return _toString.call(v) === '[object RegExp]'
        }

        /**
         * Check if val is a valid array index.
         */
        function isValidArrayIndex (val) {
          var n = parseFloat(String(val));
          return n >= 0 && Math.floor(n) === n && isFinite(val)
        }

        function isPromise (val) {
          return (
            isDef(val) &&
            typeof val.then === 'function' &&
            typeof val.catch === 'function'
          )
        }

        /**
         * Convert a value to a string that is actually rendered.
         */
        function toString (val) {
          return val == null
            ? ''
            : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
              ? JSON.stringify(val, null, 2)
              : String(val)
        }

        /**
         * Convert an input value to a number for persistence.
         * If the conversion fails, return original string.
         */
        function toNumber (val) {
          var n = parseFloat(val);
          return isNaN(n) ? val : n
        }

        /**
         * Make a map and return a function for checking if a key
         * is in that map.
         */
        function makeMap (
          str,
          expectsLowerCase
        ) {
          var map = Object.create(null);
          var list = str.split(',');
          for (var i = 0; i < list.length; i++) {
            map[list[i]] = true;
          }
          return expectsLowerCase
            ? function (val) { return map[val.toLowerCase()]; }
            : function (val) { return map[val]; }
        }

        /**
         * Check if a tag is a built-in tag.
         */
        var isBuiltInTag = makeMap('slot,component', true);

        /**
         * Check if an attribute is a reserved attribute.
         */
        var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');

        /**
         * Remove an item from an array.
         */
        function remove (arr, item) {
          if (arr.length) {
            var index = arr.indexOf(item);
            if (index > -1) {
              return arr.splice(index, 1)
            }
          }
        }

        /**
         * Check whether an object has the property.
         */
        var hasOwnProperty = Object.prototype.hasOwnProperty;
        function hasOwn (obj, key) {
          return hasOwnProperty.call(obj, key)
        }

        /**
         * Create a cached version of a pure function.
         */
        function cached (fn) {
          var cache = Object.create(null);
          return (function cachedFn (str) {
            var hit = cache[str];
            return hit || (cache[str] = fn(str))
          })
        }

        /**
         * Camelize a hyphen-delimited string.
         */
        var camelizeRE = /-(\w)/g;
        var camelize = cached(function (str) {
          return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
        });

        /**
         * Capitalize a string.
         */
        var capitalize = cached(function (str) {
          return str.charAt(0).toUpperCase() + str.slice(1)
        });

        /**
         * Hyphenate a camelCase string.
         */
        var hyphenateRE = /\B([A-Z])/g;
        var hyphenate = cached(function (str) {
          return str.replace(hyphenateRE, '-$1').toLowerCase()
        });

        /**
         * Simple bind polyfill for environments that do not support it,
         * e.g., PhantomJS 1.x. Technically, we don't need this anymore
         * since native bind is now performant enough in most browsers.
         * But removing it would mean breaking code that was able to run in
         * PhantomJS 1.x, so this must be kept for backward compatibility.
         */

        /* istanbul ignore next */
        function polyfillBind (fn, ctx) {
          function boundFn (a) {
            var l = arguments.length;
            return l
              ? l > 1
                ? fn.apply(ctx, arguments)
                : fn.call(ctx, a)
              : fn.call(ctx)
          }

          boundFn._length = fn.length;
          return boundFn
        }

        function nativeBind (fn, ctx) {
          return fn.bind(ctx)
        }

        var bind = Function.prototype.bind
          ? nativeBind
          : polyfillBind;

        /**
         * Convert an Array-like object to a real Array.
         */
        function toArray (list, start) {
          start = start || 0;
          var i = list.length - start;
          var ret = new Array(i);
          while (i--) {
            ret[i] = list[i + start];
          }
          return ret
        }

        /**
         * Mix properties into target object.
         */
        function extend (to, _from) {
          for (var key in _from) {
            to[key] = _from[key];
          }
          return to
        }

        /**
         * Merge an Array of Objects into a single Object.
         */
        function toObject (arr) {
          var res = {};
          for (var i = 0; i < arr.length; i++) {
            if (arr[i]) {
              extend(res, arr[i]);
            }
          }
          return res
        }

        /* eslint-disable no-unused-vars */

        /**
         * Perform no operation.
         * Stubbing args to make Flow happy without leaving useless transpiled code
         * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
         */
        function noop (a, b, c) { }

        /**
         * Always return false.
         */
        var no = function (a, b, c) { return false; };

        /* eslint-enable no-unused-vars */

        /**
         * Return the same value.
         */
        var identity = function (_) { return _; };

        /**
         * Generate a string containing static keys from compiler modules.
         */
        function genStaticKeys (modules) {
          return modules.reduce(function (keys, m) {
            return keys.concat(m.staticKeys || [])
          }, []).join(',')
        }

        /**
         * Check if two values are loosely equal - that is,
         * if they are plain objects, do they have the same shape?
         */
        function looseEqual (a, b) {
          if (a === b) { return true }
          var isObjectA = isObject(a);
          var isObjectB = isObject(b);
          if (isObjectA && isObjectB) {
            try {
              var isArrayA = Array.isArray(a);
              var isArrayB = Array.isArray(b);
              if (isArrayA && isArrayB) {
                return a.length === b.length && a.every(function (e, i) {
                  return looseEqual(e, b[i])
                })
              } else if (a instanceof Date && b instanceof Date) {
                return a.getTime() === b.getTime()
              } else if (!isArrayA && !isArrayB) {
                var keysA = Object.keys(a);
                var keysB = Object.keys(b);
                return keysA.length === keysB.length && keysA.every(function (key) {
                  return looseEqual(a[key], b[key])
                })
              } else {
                /* istanbul ignore next */
                return false
              }
            } catch (e) {
              /* istanbul ignore next */
              return false
            }
          } else if (!isObjectA && !isObjectB) {
            return String(a) === String(b)
          } else {
            return false
          }
        }

        /**
         * Return the first index at which a loosely equal value can be
         * found in the array (if value is a plain object, the array must
         * contain an object of the same shape), or -1 if it is not present.
         */
        function looseIndexOf (arr, val) {
          for (var i = 0; i < arr.length; i++) {
            if (looseEqual(arr[i], val)) { return i }
          }
          return -1
        }

        /**
         * Ensure a function is called only once.
         */
        function once (fn) {
          var called = false;
          return function () {
            if (!called) {
              called = true;
              fn.apply(this, arguments);
            }
          }
        }

        var SSR_ATTR = 'data-server-rendered';

        var ASSET_TYPES = [
          'component',
          'directive',
          'filter'
        ];

        var LIFECYCLE_HOOKS = [
          'beforeCreate',
          'created',
          'beforeMount',
          'mounted',
          'beforeUpdate',
          'updated',
          'beforeDestroy',
          'destroyed',
          'activated',
          'deactivated',
          'errorCaptured',
          'serverPrefetch'
        ];

        /*  */



        var config = ({
          /**
           * Option merge strategies (used in core/util/options)
           */
          // $flow-disable-line
          optionMergeStrategies: Object.create(null),

          /**
           * Whether to suppress warnings.
           */
          silent: false,

          /**
           * Show production mode tip message on boot?
           */
          productionTip: "development" !== 'production',

          /**
           * Whether to enable devtools
           */
          devtools: "development" !== 'production',

          /**
           * Whether to record perf
           */
          performance: false,

          /**
           * Error handler for watcher errors
           */
          errorHandler: null,

          /**
           * Warn handler for watcher warns
           */
          warnHandler: null,

          /**
           * Ignore certain custom elements
           */
          ignoredElements: [],

          /**
           * Custom user key aliases for v-on
           */
          // $flow-disable-line
          keyCodes: Object.create(null),

          /**
           * Check if a tag is reserved so that it cannot be registered as a
           * component. This is platform-dependent and may be overwritten.
           */
          isReservedTag: no,

          /**
           * Check if an attribute is reserved so that it cannot be used as a component
           * prop. This is platform-dependent and may be overwritten.
           */
          isReservedAttr: no,

          /**
           * Check if a tag is an unknown element.
           * Platform-dependent.
           */
          isUnknownElement: no,

          /**
           * Get the namespace of an element
           */
          getTagNamespace: noop,

          /**
           * Parse the real tag name for the specific platform.
           */
          parsePlatformTagName: identity,

          /**
           * Check if an attribute must be bound using property, e.g. value
           * Platform-dependent.
           */
          mustUseProp: no,

          /**
           * Perform updates asynchronously. Intended to be used by Vue Test Utils
           * This will significantly reduce performance if set to false.
           */
          async: true,

          /**
           * Exposed for legacy reasons
           */
          _lifecycleHooks: LIFECYCLE_HOOKS
        });

        /*  */

        /**
         * unicode letters used for parsing html tags, component names and property paths.
         * using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
         * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
         */
        var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;

        /**
         * Check if a string starts with $ or _
         */
        function isReserved (str) {
          var c = (str + '').charCodeAt(0);
          return c === 0x24 || c === 0x5F
        }

        /**
         * Define a property.
         */
        function def (obj, key, val, enumerable) {
          Object.defineProperty(obj, key, {
            value: val,
            enumerable: !!enumerable,
            writable: true,
            configurable: true
          });
        }

        /**
         * Parse simple path.
         */
        var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
        function parsePath (path) {
          if (bailRE.test(path)) {
            return
          }
          var segments = path.split('.');
          return function (obj) {
            for (var i = 0; i < segments.length; i++) {
              if (!obj) { return }
              obj = obj[segments[i]];
            }
            return obj
          }
        }

        /*  */

        // can we use __proto__?
        var hasProto = '__proto__' in {};

        // Browser environment sniffing
        var inBrowser = typeof window !== 'undefined';
        var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
        var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
        var UA = inBrowser && window.navigator.userAgent.toLowerCase();
        var isIE = UA && /msie|trident/.test(UA);
        var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
        var isEdge = UA && UA.indexOf('edge/') > 0;
        var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
        var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
        var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
        var isPhantomJS = UA && /phantomjs/.test(UA);
        var isFF = UA && UA.match(/firefox\/(\d+)/);

        // Firefox has a "watch" function on Object.prototype...
        var nativeWatch = ({}).watch;

        var supportsPassive = false;
        if (inBrowser) {
          try {
            var opts = {};
            Object.defineProperty(opts, 'passive', ({
              get: function get () {
                /* istanbul ignore next */
                supportsPassive = true;
              }
            })); // https://github.com/facebook/flow/issues/285
            window.addEventListener('test-passive', null, opts);
          } catch (e) { }
        }

        // this needs to be lazy-evaled because vue may be required before
        // vue-server-renderer can set VUE_ENV
        var _isServer;
        var isServerRendering = function () {
          if (_isServer === undefined) {
            /* istanbul ignore if */
            if (!inBrowser && !inWeex && typeof global !== 'undefined') {
              // detect presence of vue-server-renderer and avoid
              // Webpack shimming the process
              _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
            } else {
              _isServer = false;
            }
          }
          return _isServer
        };

        // detect devtools
        var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

        /* istanbul ignore next */
        function isNative (Ctor) {
          return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
        }

        var hasSymbol =
          typeof Symbol !== 'undefined' && isNative(Symbol) &&
          typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

        var _Set;
        /* istanbul ignore if */ // $flow-disable-line
        if (typeof Set !== 'undefined' && isNative(Set)) {
          // use native Set when available.
          _Set = Set;
        } else {
          // a non-standard Set polyfill that only works with primitive keys.
          _Set = /*@__PURE__*/(function () {
            function Set () {
              this.set = Object.create(null);
            }
            Set.prototype.has = function has (key) {
              return this.set[key] === true
            };
            Set.prototype.add = function add (key) {
              this.set[key] = true;
            };
            Set.prototype.clear = function clear () {
              this.set = Object.create(null);
            };

            return Set;
          }());
        }

        /*  */

        var warn = noop;
        var tip = noop;
        var generateComponentTrace = (noop); // work around flow check
        var formatComponentName = (noop);

        {
          var hasConsole = typeof console !== 'undefined';
          var classifyRE = /(?:^|[-_])(\w)/g;
          var classify = function (str) {
            return str
              .replace(classifyRE, function (c) { return c.toUpperCase(); })
              .replace(/[-_]/g, '');
          };

          warn = function (msg, vm) {
            var trace = vm ? generateComponentTrace(vm) : '';

            if (config.warnHandler) {
              config.warnHandler.call(null, msg, vm, trace);
            } else if (hasConsole && (!config.silent)) {
              console.error(("[Vue warn]: " + msg + trace));
            }
          };

          tip = function (msg, vm) {
            if (hasConsole && (!config.silent)) {
              console.warn("[Vue tip]: " + msg + (
                vm ? generateComponentTrace(vm) : ''
              ));
            }
          };

          formatComponentName = function (vm, includeFile) {
            if (vm.$root === vm) {
              return '<Root>'
            }
            var options = typeof vm === 'function' && vm.cid != null
              ? vm.options
              : vm._isVue
                ? vm.$options || vm.constructor.options
                : vm;
            var name = options.name || options._componentTag;
            var file = options.__file;
            if (!name && file) {
              var match = file.match(/([^/\\]+)\.vue$/);
              name = match && match[1];
            }

            return (
              (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
              (file && includeFile !== false ? (" at " + file) : '')
            )
          };

          var repeat = function (str, n) {
            var res = '';
            while (n) {
              if (n % 2 === 1) { res += str; }
              if (n > 1) { str += str; }
              n >>= 1;
            }
            return res
          };

          generateComponentTrace = function (vm) {
            if (vm._isVue && vm.$parent) {
              var tree = [];
              var currentRecursiveSequence = 0;
              while (vm) {
                if (tree.length > 0) {
                  var last = tree[tree.length - 1];
                  if (last.constructor === vm.constructor) {
                    currentRecursiveSequence++;
                    vm = vm.$parent;
                    continue
                  } else if (currentRecursiveSequence > 0) {
                    tree[tree.length - 1] = [last, currentRecursiveSequence];
                    currentRecursiveSequence = 0;
                  }
                }
                tree.push(vm);
                vm = vm.$parent;
              }
              return '\n\nfound in\n\n' + tree
                .map(function (vm, i) {
                  return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
                    ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
                    : formatComponentName(vm)));
                })
                .join('\n')
            } else {
              return ("\n\n(found in " + (formatComponentName(vm)) + ")")
            }
          };
        }

        /*  */

        var uid = 0;

        /**
         * A dep is an observable that can have multiple
         * directives subscribing to it.
         */
        var Dep = function Dep () {
          this.id = uid++;
          this.subs = [];
        };

        Dep.prototype.addSub = function addSub (sub) {
          this.subs.push(sub);
        };

        Dep.prototype.removeSub = function removeSub (sub) {
          remove(this.subs, sub);
        };

        Dep.prototype.depend = function depend () {
          if (Dep.target) {
            Dep.target.addDep(this);
          }
        };

        Dep.prototype.notify = function notify () {
          // stabilize the subscriber list first
          var subs = this.subs.slice();
          if (!config.async) {
            // subs aren't sorted in scheduler if not running async
            // we need to sort them now to make sure they fire in correct
            // order
            subs.sort(function (a, b) { return a.id - b.id; });
          }
          for (var i = 0, l = subs.length; i < l; i++) {
            subs[i].update();
          }
        };

        // The current target watcher being evaluated.
        // This is globally unique because only one watcher
        // can be evaluated at a time.
        Dep.target = null;
        var targetStack = [];

        function pushTarget (target) {
          targetStack.push(target);
          Dep.target = target;
        }

        function popTarget () {
          targetStack.pop();
          Dep.target = targetStack[targetStack.length - 1];
        }

        /*  */

        var VNode = function VNode (
          tag,
          data,
          children,
          text,
          elm,
          context,
          componentOptions,
          asyncFactory
        ) {
          this.tag = tag;
          this.data = data;
          this.children = children;
          this.text = text;
          this.elm = elm;
          this.ns = undefined;
          this.context = context;
          this.fnContext = undefined;
          this.fnOptions = undefined;
          this.fnScopeId = undefined;
          this.key = data && data.key;
          this.componentOptions = componentOptions;
          this.componentInstance = undefined;
          this.parent = undefined;
          this.raw = false;
          this.isStatic = false;
          this.isRootInsert = true;
          this.isComment = false;
          this.isCloned = false;
          this.isOnce = false;
          this.asyncFactory = asyncFactory;
          this.asyncMeta = undefined;
          this.isAsyncPlaceholder = false;
        };

        var prototypeAccessors = { child: { configurable: true } };

        // DEPRECATED: alias for componentInstance for backwards compat.
        /* istanbul ignore next */
        prototypeAccessors.child.get = function () {
          return this.componentInstance
        };

        Object.defineProperties(VNode.prototype, prototypeAccessors);

        var createEmptyVNode = function (text) {
          if (text === void 0) text = '';

          var node = new VNode();
          node.text = text;
          node.isComment = true;
          return node
        };

        function createTextVNode (val) {
          return new VNode(undefined, undefined, undefined, String(val))
        }

        // optimized shallow clone
        // used for static nodes and slot nodes because they may be reused across
        // multiple renders, cloning them avoids errors when DOM manipulations rely
        // on their elm reference.
        function cloneVNode (vnode) {
          var cloned = new VNode(
            vnode.tag,
            vnode.data,
            // #7975
            // clone children array to avoid mutating original in case of cloning
            // a child.
            vnode.children && vnode.children.slice(),
            vnode.text,
            vnode.elm,
            vnode.context,
            vnode.componentOptions,
            vnode.asyncFactory
          );
          cloned.ns = vnode.ns;
          cloned.isStatic = vnode.isStatic;
          cloned.key = vnode.key;
          cloned.isComment = vnode.isComment;
          cloned.fnContext = vnode.fnContext;
          cloned.fnOptions = vnode.fnOptions;
          cloned.fnScopeId = vnode.fnScopeId;
          cloned.asyncMeta = vnode.asyncMeta;
          cloned.isCloned = true;
          return cloned
        }

        /*
         * not type checking this file because flow doesn't play well with
         * dynamically accessing methods on Array prototype
         */

        var arrayProto = Array.prototype;
        var arrayMethods = Object.create(arrayProto);

        var methodsToPatch = [
          'push',
          'pop',
          'shift',
          'unshift',
          'splice',
          'sort',
          'reverse'
        ];

        /**
         * Intercept mutating methods and emit events
         */
        methodsToPatch.forEach(function (method) {
          // cache original method
          var original = arrayProto[method];
          def(arrayMethods, method, function mutator () {
            var args = [], len = arguments.length;
            while (len--) args[len] = arguments[len];

            var result = original.apply(this, args);
            var ob = this.__ob__;
            var inserted;
            switch (method) {
              case 'push':
              case 'unshift':
                inserted = args;
                break
              case 'splice':
                inserted = args.slice(2);
                break
            }
            if (inserted) { ob.observeArray(inserted); }
            // notify change
            ob.dep.notify();
            return result
          });
        });

        /*  */

        var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

        /**
         * In some cases we may want to disable observation inside a component's
         * update computation.
         */
        var shouldObserve = true;

        function toggleObserving (value) {
          shouldObserve = value;
        }

        /**
         * Observer class that is attached to each observed
         * object. Once attached, the observer converts the target
         * object's property keys into getter/setters that
         * collect dependencies and dispatch updates.
         */
        var Observer = function Observer (value) {
          this.value = value;
          this.dep = new Dep();
          this.vmCount = 0;
          def(value, '__ob__', this);
          if (Array.isArray(value)) {
            if (hasProto) {
              protoAugment(value, arrayMethods);
            } else {
              copyAugment(value, arrayMethods, arrayKeys);
            }
            this.observeArray(value);
          } else {
            this.walk(value);
          }
        };

        /**
         * Walk through all properties and convert them into
         * getter/setters. This method should only be called when
         * value type is Object.
         */
        Observer.prototype.walk = function walk (obj) {
          var keys = Object.keys(obj);
          for (var i = 0; i < keys.length; i++) {
            defineReactive$$1(obj, keys[i]);
          }
        };

        /**
         * Observe a list of Array items.
         */
        Observer.prototype.observeArray = function observeArray (items) {
          for (var i = 0, l = items.length; i < l; i++) {
            observe(items[i]);
          }
        };

        // helpers

        /**
         * Augment a target Object or Array by intercepting
         * the prototype chain using __proto__
         */
        function protoAugment (target, src) {
          /* eslint-disable no-proto */
          target.__proto__ = src;
          /* eslint-enable no-proto */
        }

        /**
         * Augment a target Object or Array by defining
         * hidden properties.
         */
        /* istanbul ignore next */
        function copyAugment (target, src, keys) {
          for (var i = 0, l = keys.length; i < l; i++) {
            var key = keys[i];
            def(target, key, src[key]);
          }
        }

        /**
         * Attempt to create an observer instance for a value,
         * returns the new observer if successfully observed,
         * or the existing observer if the value already has one.
         */
        function observe (value, asRootData) {
          if (!isObject(value) || value instanceof VNode) {
            return
          }
          var ob;
          if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
            ob = value.__ob__;
          } else if (
            shouldObserve &&
            !isServerRendering() &&
            (Array.isArray(value) || isPlainObject(value)) &&
            Object.isExtensible(value) &&
            !value._isVue
          ) {
            ob = new Observer(value);
          }
          if (asRootData && ob) {
            ob.vmCount++;
          }
          return ob
        }

        /**
         * Define a reactive property on an Object.
         */
        function defineReactive$$1 (
          obj,
          key,
          val,
          customSetter,
          shallow
        ) {
          var dep = new Dep();

          var property = Object.getOwnPropertyDescriptor(obj, key);
          if (property && property.configurable === false) {
            return
          }

          // cater for pre-defined getter/setters
          var getter = property && property.get;
          var setter = property && property.set;
          if ((!getter || setter) && arguments.length === 2) {
            val = obj[key];
          }

          var childOb = !shallow && observe(val);
          Object.defineProperty(obj, key, {
            enumerable: true,
            configurable: true,
            get: function reactiveGetter () {
              var value = getter ? getter.call(obj) : val;
              if (Dep.target) {
                dep.depend();
                if (childOb) {
                  childOb.dep.depend();
                  if (Array.isArray(value)) {
                    dependArray(value);
                  }
                }
              }
              return value
            },
            set: function reactiveSetter (newVal) {
              var value = getter ? getter.call(obj) : val;
              /* eslint-disable no-self-compare */
              if (newVal === value || (newVal !== newVal && value !== value)) {
                return
              }
              /* eslint-enable no-self-compare */
              if (customSetter) {
                customSetter();
              }
              // #7981: for accessor properties without setter
              if (getter && !setter) { return }
              if (setter) {
                setter.call(obj, newVal);
              } else {
                val = newVal;
              }
              childOb = !shallow && observe(newVal);
              dep.notify();
            }
          });
        }

        /**
         * Set a property on an object. Adds the new property and
         * triggers change notification if the property doesn't
         * already exist.
         */
        function set (target, key, val) {
          if (isUndef(target) || isPrimitive(target)
          ) {
            warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
          }
          if (Array.isArray(target) && isValidArrayIndex(key)) {
            target.length = Math.max(target.length, key);
            target.splice(key, 1, val);
            return val
          }
          if (key in target && !(key in Object.prototype)) {
            target[key] = val;
            return val
          }
          var ob = (target).__ob__;
          if (target._isVue || (ob && ob.vmCount)) {
            warn(
              'Avoid adding reactive properties to a Vue instance or its root $data ' +
              'at runtime - declare it upfront in the data option.'
            );
            return val
          }
          if (!ob) {
            target[key] = val;
            return val
          }
          defineReactive$$1(ob.value, key, val);
          ob.dep.notify();
          return val
        }

        /**
         * Delete a property and trigger change if necessary.
         */
        function del (target, key) {
          if (isUndef(target) || isPrimitive(target)
          ) {
            warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
          }
          if (Array.isArray(target) && isValidArrayIndex(key)) {
            target.splice(key, 1);
            return
          }
          var ob = (target).__ob__;
          if (target._isVue || (ob && ob.vmCount)) {
            warn(
              'Avoid deleting properties on a Vue instance or its root $data ' +
              '- just set it to null.'
            );
            return
          }
          if (!hasOwn(target, key)) {
            return
          }
          delete target[key];
          if (!ob) {
            return
          }
          ob.dep.notify();
        }

        /**
         * Collect dependencies on array elements when the array is touched, since
         * we cannot intercept array element access like property getters.
         */
        function dependArray (value) {
          for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
            e = value[i];
            e && e.__ob__ && e.__ob__.dep.depend();
            if (Array.isArray(e)) {
              dependArray(e);
            }
          }
        }

        /*  */

        /**
         * Option overwriting strategies are functions that handle
         * how to merge a parent option value and a child option
         * value into the final value.
         */
        var strats = config.optionMergeStrategies;

        /**
         * Options with restrictions
         */
        {
          strats.el = strats.propsData = function (parent, child, vm, key) {
            if (!vm) {
              warn(
                "option \"" + key + "\" can only be used during instance " +
                'creation with the `new` keyword.'
              );
            }
            return defaultStrat(parent, child)
          };
        }

        /**
         * Helper that recursively merges two data objects together.
         */
        function mergeData (to, from) {
          if (!from) { return to }
          var key, toVal, fromVal;

          var keys = hasSymbol
            ? Reflect.ownKeys(from)
            : Object.keys(from);

          for (var i = 0; i < keys.length; i++) {
            key = keys[i];
            // in case the object is already observed...
            if (key === '__ob__') { continue }
            toVal = to[key];
            fromVal = from[key];
            if (!hasOwn(to, key)) {
              set(to, key, fromVal);
            } else if (
              toVal !== fromVal &&
              isPlainObject(toVal) &&
              isPlainObject(fromVal)
            ) {
              mergeData(toVal, fromVal);
            }
          }
          return to
        }

        /**
         * Data
         */
        function mergeDataOrFn (
          parentVal,
          childVal,
          vm
        ) {
          if (!vm) {
            // in a Vue.extend merge, both should be functions
            if (!childVal) {
              return parentVal
            }
            if (!parentVal) {
              return childVal
            }
            // when parentVal & childVal are both present,
            // we need to return a function that returns the
            // merged result of both functions... no need to
            // check if parentVal is a function here because
            // it has to be a function to pass previous merges.
            return function mergedDataFn () {
              return mergeData(
                typeof childVal === 'function' ? childVal.call(this, this) : childVal,
                typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
              )
            }
          } else {
            return function mergedInstanceDataFn () {
              // instance merge
              var instanceData = typeof childVal === 'function'
                ? childVal.call(vm, vm)
                : childVal;
              var defaultData = typeof parentVal === 'function'
                ? parentVal.call(vm, vm)
                : parentVal;
              if (instanceData) {
                return mergeData(instanceData, defaultData)
              } else {
                return defaultData
              }
            }
          }
        }

        strats.data = function (
          parentVal,
          childVal,
          vm
        ) {
          if (!vm) {
            if (childVal && typeof childVal !== 'function') {
              warn(
                'The "data" option should be a function ' +
                'that returns a per-instance value in component ' +
                'definitions.',
                vm
              );

              return parentVal
            }
            return mergeDataOrFn(parentVal, childVal)
          }

          return mergeDataOrFn(parentVal, childVal, vm)
        };

        /**
         * Hooks and props are merged as arrays.
         */
        function mergeHook (
          parentVal,
          childVal
        ) {
          var res = childVal
            ? parentVal
              ? parentVal.concat(childVal)
              : Array.isArray(childVal)
                ? childVal
                : [childVal]
            : parentVal;
          return res
            ? dedupeHooks(res)
            : res
        }

        function dedupeHooks (hooks) {
          var res = [];
          for (var i = 0; i < hooks.length; i++) {
            if (res.indexOf(hooks[i]) === -1) {
              res.push(hooks[i]);
            }
          }
          return res
        }

        LIFECYCLE_HOOKS.forEach(function (hook) {
          strats[hook] = mergeHook;
        });

        /**
         * Assets
         *
         * When a vm is present (instance creation), we need to do
         * a three-way merge between constructor options, instance
         * options and parent options.
         */
        function mergeAssets (
          parentVal,
          childVal,
          vm,
          key
        ) {
          var res = Object.create(parentVal || null);
          if (childVal) {
            assertObjectType(key, childVal, vm);
            return extend(res, childVal)
          } else {
            return res
          }
        }

        ASSET_TYPES.forEach(function (type) {
          strats[type + 's'] = mergeAssets;
        });

        /**
         * Watchers.
         *
         * Watchers hashes should not overwrite one
         * another, so we merge them as arrays.
         */
        strats.watch = function (
          parentVal,
          childVal,
          vm,
          key
        ) {
          // work around Firefox's Object.prototype.watch...
          if (parentVal === nativeWatch) { parentVal = undefined; }
          if (childVal === nativeWatch) { childVal = undefined; }
          /* istanbul ignore if */
          if (!childVal) { return Object.create(parentVal || null) }
          {
            assertObjectType(key, childVal, vm);
          }
          if (!parentVal) { return childVal }
          var ret = {};
          extend(ret, parentVal);
          for (var key$1 in childVal) {
            var parent = ret[key$1];
            var child = childVal[key$1];
            if (parent && !Array.isArray(parent)) {
              parent = [parent];
            }
            ret[key$1] = parent
              ? parent.concat(child)
              : Array.isArray(child) ? child : [child];
          }
          return ret
        };

        /**
         * Other object hashes.
         */
        strats.props =
          strats.methods =
          strats.inject =
          strats.computed = function (
            parentVal,
            childVal,
            vm,
            key
          ) {
            if (childVal && "development" !== 'production') {
              assertObjectType(key, childVal, vm);
            }
            if (!parentVal) { return childVal }
            var ret = Object.create(null);
            extend(ret, parentVal);
            if (childVal) { extend(ret, childVal); }
            return ret
          };
        strats.provide = mergeDataOrFn;

        /**
         * Default strategy.
         */
        var defaultStrat = function (parentVal, childVal) {
          return childVal === undefined
            ? parentVal
            : childVal
        };

        /**
         * Validate component names
         */
        function checkComponents (options) {
          for (var key in options.components) {
            validateComponentName(key);
          }
        }

        function validateComponentName (name) {
          if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
            warn(
              'Invalid component name: "' + name + '". Component names ' +
              'should conform to valid custom element name in html5 specification.'
            );
          }
          if (isBuiltInTag(name) || config.isReservedTag(name)) {
            warn(
              'Do not use built-in or reserved HTML elements as component ' +
              'id: ' + name
            );
          }
        }

        /**
         * Ensure all props option syntax are normalized into the
         * Object-based format.
         */
        function normalizeProps (options, vm) {
          var props = options.props;
          if (!props) { return }
          var res = {};
          var i, val, name;
          if (Array.isArray(props)) {
            i = props.length;
            while (i--) {
              val = props[i];
              if (typeof val === 'string') {
                name = camelize(val);
                res[name] = { type: null };
              } else {
                warn('props must be strings when using array syntax.');
              }
            }
          } else if (isPlainObject(props)) {
            for (var key in props) {
              val = props[key];
              name = camelize(key);
              res[name] = isPlainObject(val)
                ? val
                : { type: val };
            }
          } else {
            warn(
              "Invalid value for option \"props\": expected an Array or an Object, " +
              "but got " + (toRawType(props)) + ".",
              vm
            );
          }
          options.props = res;
        }

        /**
         * Normalize all injections into Object-based format
         */
        function normalizeInject (options, vm) {
          var inject = options.inject;
          if (!inject) { return }
          var normalized = options.inject = {};
          if (Array.isArray(inject)) {
            for (var i = 0; i < inject.length; i++) {
              normalized[inject[i]] = { from: inject[i] };
            }
          } else if (isPlainObject(inject)) {
            for (var key in inject) {
              var val = inject[key];
              normalized[key] = isPlainObject(val)
                ? extend({ from: key }, val)
                : { from: val };
            }
          } else {
            warn(
              "Invalid value for option \"inject\": expected an Array or an Object, " +
              "but got " + (toRawType(inject)) + ".",
              vm
            );
          }
        }

        /**
         * Normalize raw function directives into object format.
         */
        function normalizeDirectives (options) {
          var dirs = options.directives;
          if (dirs) {
            for (var key in dirs) {
              var def$$1 = dirs[key];
              if (typeof def$$1 === 'function') {
                dirs[key] = { bind: def$$1, update: def$$1 };
              }
            }
          }
        }

        function assertObjectType (name, value, vm) {
          if (!isPlainObject(value)) {
            warn(
              "Invalid value for option \"" + name + "\": expected an Object, " +
              "but got " + (toRawType(value)) + ".",
              vm
            );
          }
        }

        /**
         * Merge two option objects into a new one.
         * Core utility used in both instantiation and inheritance.
         */
        function mergeOptions (
          parent,
          child,
          vm
        ) {
          {
            checkComponents(child);
          }

          if (typeof child === 'function') {
            child = child.options;
          }

          normalizeProps(child, vm);
          normalizeInject(child, vm);
          normalizeDirectives(child);

          // Apply extends and mixins on the child options,
          // but only if it is a raw options object that isn't
          // the result of another mergeOptions call.
          // Only merged options has the _base property.
          if (!child._base) {
            if (child.extends) {
              parent = mergeOptions(parent, child.extends, vm);
            }
            if (child.mixins) {
              for (var i = 0, l = child.mixins.length; i < l; i++) {
                parent = mergeOptions(parent, child.mixins[i], vm);
              }
            }
          }

          var options = {};
          var key;
          for (key in parent) {
            mergeField(key);
          }
          for (key in child) {
            if (!hasOwn(parent, key)) {
              mergeField(key);
            }
          }
          function mergeField (key) {
            var strat = strats[key] || defaultStrat;
            options[key] = strat(parent[key], child[key], vm, key);
          }
          return options
        }

        /**
         * Resolve an asset.
         * This function is used because child instances need access
         * to assets defined in its ancestor chain.
         */
        function resolveAsset (
          options,
          type,
          id,
          warnMissing
        ) {
          /* istanbul ignore if */
          if (typeof id !== 'string') {
            return
          }
          var assets = options[type];
          // check local registration variations first
          if (hasOwn(assets, id)) { return assets[id] }
          var camelizedId = camelize(id);
          if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
          var PascalCaseId = capitalize(camelizedId);
          if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
          // fallback to prototype chain
          var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
          if (warnMissing && !res) {
            warn(
              'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
              options
            );
          }
          return res
        }

        /*  */



        function validateProp (
          key,
          propOptions,
          propsData,
          vm
        ) {
          var prop = propOptions[key];
          var absent = !hasOwn(propsData, key);
          var value = propsData[key];
          // boolean casting
          var booleanIndex = getTypeIndex(Boolean, prop.type);
          if (booleanIndex > -1) {
            if (absent && !hasOwn(prop, 'default')) {
              value = false;
            } else if (value === '' || value === hyphenate(key)) {
              // only cast empty string / same name to boolean if
              // boolean has higher priority
              var stringIndex = getTypeIndex(String, prop.type);
              if (stringIndex < 0 || booleanIndex < stringIndex) {
                value = true;
              }
            }
          }
          // check default value
          if (value === undefined) {
            value = getPropDefaultValue(vm, prop, key);
            // since the default value is a fresh copy,
            // make sure to observe it.
            var prevShouldObserve = shouldObserve;
            toggleObserving(true);
            observe(value);
            toggleObserving(prevShouldObserve);
          }
          {
            assertProp(prop, key, value, vm, absent);
          }
          return value
        }

        /**
         * Get the default value of a prop.
         */
        function getPropDefaultValue (vm, prop, key) {
          // no default, return undefined
          if (!hasOwn(prop, 'default')) {
            return undefined
          }
          var def = prop.default;
          // warn against non-factory defaults for Object & Array
          if (isObject(def)) {
            warn(
              'Invalid default value for prop "' + key + '": ' +
              'Props with type Object/Array must use a factory function ' +
              'to return the default value.',
              vm
            );
          }
          // the raw prop value was also undefined from previous render,
          // return previous default value to avoid unnecessary watcher trigger
          if (vm && vm.$options.propsData &&
            vm.$options.propsData[key] === undefined &&
            vm._props[key] !== undefined
          ) {
            return vm._props[key]
          }
          // call factory function for non-Function types
          // a value is Function if its prototype is function even across different execution context
          return typeof def === 'function' && getType(prop.type) !== 'Function'
            ? def.call(vm)
            : def
        }

        /**
         * Assert whether a prop is valid.
         */
        function assertProp (
          prop,
          name,
          value,
          vm,
          absent
        ) {
          if (prop.required && absent) {
            warn(
              'Missing required prop: "' + name + '"',
              vm
            );
            return
          }
          if (value == null && !prop.required) {
            return
          }
          var type = prop.type;
          var valid = !type || type === true;
          var expectedTypes = [];
          if (type) {
            if (!Array.isArray(type)) {
              type = [type];
            }
            for (var i = 0; i < type.length && !valid; i++) {
              var assertedType = assertType(value, type[i], vm);
              expectedTypes.push(assertedType.expectedType || '');
              valid = assertedType.valid;
            }
          }

          var haveExpectedTypes = expectedTypes.some(function (t) { return t; });
          if (!valid && haveExpectedTypes) {
            warn(
              getInvalidTypeMessage(name, value, expectedTypes),
              vm
            );
            return
          }
          var validator = prop.validator;
          if (validator) {
            if (!validator(value)) {
              warn(
                'Invalid prop: custom validator check failed for prop "' + name + '".',
                vm
              );
            }
          }
        }

        var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol|BigInt)$/;

        function assertType (value, type, vm) {
          var valid;
          var expectedType = getType(type);
          if (simpleCheckRE.test(expectedType)) {
            var t = typeof value;
            valid = t === expectedType.toLowerCase();
            // for primitive wrapper objects
            if (!valid && t === 'object') {
              valid = value instanceof type;
            }
          } else if (expectedType === 'Object') {
            valid = isPlainObject(value);
          } else if (expectedType === 'Array') {
            valid = Array.isArray(value);
          } else {
            try {
              valid = value instanceof type;
            } catch (e) {
              warn('Invalid prop type: "' + String(type) + '" is not a constructor', vm);
              valid = false;
            }
          }
          return {
            valid: valid,
            expectedType: expectedType
          }
        }

        var functionTypeCheckRE = /^\s*function (\w+)/;

        /**
         * Use function string name to check built-in types,
         * because a simple equality check will fail when running
         * across different vms / iframes.
         */
        function getType (fn) {
          var match = fn && fn.toString().match(functionTypeCheckRE);
          return match ? match[1] : ''
        }

        function isSameType (a, b) {
          return getType(a) === getType(b)
        }

        function getTypeIndex (type, expectedTypes) {
          if (!Array.isArray(expectedTypes)) {
            return isSameType(expectedTypes, type) ? 0 : -1
          }
          for (var i = 0, len = expectedTypes.length; i < len; i++) {
            if (isSameType(expectedTypes[i], type)) {
              return i
            }
          }
          return -1
        }

        function getInvalidTypeMessage (name, value, expectedTypes) {
          var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
            " Expected " + (expectedTypes.map(capitalize).join(', '));
          var expectedType = expectedTypes[0];
          var receivedType = toRawType(value);
          // check if we need to specify expected value
          if (
            expectedTypes.length === 1 &&
            isExplicable(expectedType) &&
            isExplicable(typeof value) &&
            !isBoolean(expectedType, receivedType)
          ) {
            message += " with value " + (styleValue(value, expectedType));
          }
          message += ", got " + receivedType + " ";
          // check if we need to specify received value
          if (isExplicable(receivedType)) {
            message += "with value " + (styleValue(value, receivedType)) + ".";
          }
          return message
        }

        function styleValue (value, type) {
          if (type === 'String') {
            return ("\"" + value + "\"")
          } else if (type === 'Number') {
            return ("" + (Number(value)))
          } else {
            return ("" + value)
          }
        }

        var EXPLICABLE_TYPES = ['string', 'number', 'boolean'];
        function isExplicable (value) {
          return EXPLICABLE_TYPES.some(function (elem) { return value.toLowerCase() === elem; })
        }

        function isBoolean () {
          var args = [], len = arguments.length;
          while (len--) args[len] = arguments[len];

          return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })
        }

        /*  */

        function handleError (err, vm, info) {
          // Deactivate deps tracking while processing error handler to avoid possible infinite rendering.
          // See: https://github.com/vuejs/vuex/issues/1505
          pushTarget();
          try {
            if (vm) {
              var cur = vm;
              while ((cur = cur.$parent)) {
                var hooks = cur.$options.errorCaptured;
                if (hooks) {
                  for (var i = 0; i < hooks.length; i++) {
                    try {
                      var capture = hooks[i].call(cur, err, vm, info) === false;
                      if (capture) { return }
                    } catch (e) {
                      globalHandleError(e, cur, 'errorCaptured hook');
                    }
                  }
                }
              }
            }
            globalHandleError(err, vm, info);
          } finally {
            popTarget();
          }
        }

        function invokeWithErrorHandling (
          handler,
          context,
          args,
          vm,
          info
        ) {
          var res;
          try {
            res = args ? handler.apply(context, args) : handler.call(context);
            if (res && !res._isVue && isPromise(res) && !res._handled) {
              res.catch(function (e) { return handleError(e, vm, info + " (Promise/async)"); });
              // issue #9511
              // avoid catch triggering multiple times when nested calls
              res._handled = true;
            }
          } catch (e) {
            handleError(e, vm, info);
          }
          return res
        }

        function globalHandleError (err, vm, info) {
          if (config.errorHandler) {
            try {
              return config.errorHandler.call(null, err, vm, info)
            } catch (e) {
              // if the user intentionally throws the original error in the handler,
              // do not log it twice
              if (e !== err) {
                logError(e, null, 'config.errorHandler');
              }
            }
          }
          logError(err, vm, info);
        }

        function logError (err, vm, info) {
          {
            warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
          }
          /* istanbul ignore else */
          if ((inBrowser || inWeex) && typeof console !== 'undefined') {
            console.error(err);
          } else {
            throw err
          }
        }

        /*  */

        var isUsingMicroTask = false;

        var callbacks = [];
        var pending = false;

        function flushCallbacks () {
          pending = false;
          var copies = callbacks.slice(0);
          callbacks.length = 0;
          for (var i = 0; i < copies.length; i++) {
            copies[i]();
          }
        }

        // Here we have async deferring wrappers using microtasks.
        // In 2.5 we used (macro) tasks (in combination with microtasks).
        // However, it has subtle problems when state is changed right before repaint
        // (e.g. #6813, out-in transitions).
        // Also, using (macro) tasks in event handler would cause some weird behaviors
        // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
        // So we now use microtasks everywhere, again.
        // A major drawback of this tradeoff is that there are some scenarios
        // where microtasks have too high a priority and fire in between supposedly
        // sequential events (e.g. #4521, #6690, which have workarounds)
        // or even between bubbling of the same event (#6566).
        var timerFunc;

        // The nextTick behavior leverages the microtask queue, which can be accessed
        // via either native Promise.then or MutationObserver.
        // MutationObserver has wider support, however it is seriously bugged in
        // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
        // completely stops working after triggering a few times... so, if native
        // Promise is available, we will use it:
        /* istanbul ignore next, $flow-disable-line */
        if (typeof Promise !== 'undefined' && isNative(Promise)) {
          var p = Promise.resolve();
          timerFunc = function () {
            p.then(flushCallbacks);
            // In problematic UIWebViews, Promise.then doesn't completely break, but
            // it can get stuck in a weird state where callbacks are pushed into the
            // microtask queue but the queue isn't being flushed, until the browser
            // needs to do some other work, e.g. handle a timer. Therefore we can
            // "force" the microtask queue to be flushed by adding an empty timer.
            if (isIOS) { setTimeout(noop); }
          };
          isUsingMicroTask = true;
        } else if (!isIE && typeof MutationObserver !== 'undefined' && (
          isNative(MutationObserver) ||
          // PhantomJS and iOS 7.x
          MutationObserver.toString() === '[object MutationObserverConstructor]'
        )) {
          // Use MutationObserver where native Promise is not available,
          // e.g. PhantomJS, iOS7, Android 4.4
          // (#6466 MutationObserver is unreliable in IE11)
          var counter = 1;
          var observer = new MutationObserver(flushCallbacks);
          var textNode = document.createTextNode(String(counter));
          observer.observe(textNode, {
            characterData: true
          });
          timerFunc = function () {
            counter = (counter + 1) % 2;
            textNode.data = String(counter);
          };
          isUsingMicroTask = true;
        } else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
          // Fallback to setImmediate.
          // Technically it leverages the (macro) task queue,
          // but it is still a better choice than setTimeout.
          timerFunc = function () {
            setImmediate(flushCallbacks);
          };
        } else {
          // Fallback to setTimeout.
          timerFunc = function () {
            setTimeout(flushCallbacks, 0);
          };
        }

        function nextTick (cb, ctx) {
          var _resolve;
          callbacks.push(function () {
            if (cb) {
              try {
                cb.call(ctx);
              } catch (e) {
                handleError(e, ctx, 'nextTick');
              }
            } else if (_resolve) {
              _resolve(ctx);
            }
          });
          if (!pending) {
            pending = true;
            timerFunc();
          }
          // $flow-disable-line
          if (!cb && typeof Promise !== 'undefined') {
            return new Promise(function (resolve) {
              _resolve = resolve;
            })
          }
        }

        /*  */

        var mark;
        var measure;

        {
          var perf = inBrowser && window.performance;
          /* istanbul ignore if */
          if (
            perf &&
            perf.mark &&
            perf.measure &&
            perf.clearMarks &&
            perf.clearMeasures
          ) {
            mark = function (tag) { return perf.mark(tag); };
            measure = function (name, startTag, endTag) {
              perf.measure(name, startTag, endTag);
              perf.clearMarks(startTag);
              perf.clearMarks(endTag);
              // perf.clearMeasures(name)
            };
          }
        }

        /* not type checking this file because flow doesn't play well with Proxy */

        var initProxy;

        {
          var allowedGlobals = makeMap(
            'Infinity,undefined,NaN,isFinite,isNaN,' +
            'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
            'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,BigInt,' +
            'require' // for Webpack/Browserify
          );

          var warnNonPresent = function (target, key) {
            warn(
              "Property or method \"" + key + "\" is not defined on the instance but " +
              'referenced during render. Make sure that this property is reactive, ' +
              'either in the data option, or for class-based components, by ' +
              'initializing the property. ' +
              'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
              target
            );
          };

          var warnReservedPrefix = function (target, key) {
            warn(
              "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
              'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
              'prevent conflicts with Vue internals. ' +
              'See: https://vuejs.org/v2/api/#data',
              target
            );
          };

          var hasProxy =
            typeof Proxy !== 'undefined' && isNative(Proxy);

          if (hasProxy) {
            var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
            config.keyCodes = new Proxy(config.keyCodes, {
              set: function set (target, key, value) {
                if (isBuiltInModifier(key)) {
                  warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                  return false
                } else {
                  target[key] = value;
                  return true
                }
              }
            });
          }

          var hasHandler = {
            has: function has (target, key) {
              var has = key in target;
              var isAllowed = allowedGlobals(key) ||
                (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
              if (!has && !isAllowed) {
                if (key in target.$data) { warnReservedPrefix(target, key); }
                else { warnNonPresent(target, key); }
              }
              return has || !isAllowed
            }
          };

          var getHandler = {
            get: function get (target, key) {
              if (typeof key === 'string' && !(key in target)) {
                if (key in target.$data) { warnReservedPrefix(target, key); }
                else { warnNonPresent(target, key); }
              }
              return target[key]
            }
          };

          initProxy = function initProxy (vm) {
            if (hasProxy) {
              // determine which proxy handler to use
              var options = vm.$options;
              var handlers = options.render && options.render._withStripped
                ? getHandler
                : hasHandler;
              vm._renderProxy = new Proxy(vm, handlers);
            } else {
              vm._renderProxy = vm;
            }
          };
        }

        /*  */

        var seenObjects = new _Set();

        /**
         * Recursively traverse an object to evoke all converted
         * getters, so that every nested property inside the object
         * is collected as a "deep" dependency.
         */
        function traverse (val) {
          _traverse(val, seenObjects);
          seenObjects.clear();
        }

        function _traverse (val, seen) {
          var i, keys;
          var isA = Array.isArray(val);
          if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
            return
          }
          if (val.__ob__) {
            var depId = val.__ob__.dep.id;
            if (seen.has(depId)) {
              return
            }
            seen.add(depId);
          }
          if (isA) {
            i = val.length;
            while (i--) { _traverse(val[i], seen); }
          } else {
            keys = Object.keys(val);
            i = keys.length;
            while (i--) { _traverse(val[keys[i]], seen); }
          }
        }

        /*  */

        var normalizeEvent = cached(function (name) {
          var passive = name.charAt(0) === '&';
          name = passive ? name.slice(1) : name;
          var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
          name = once$$1 ? name.slice(1) : name;
          var capture = name.charAt(0) === '!';
          name = capture ? name.slice(1) : name;
          return {
            name: name,
            once: once$$1,
            capture: capture,
            passive: passive
          }
        });

        function createFnInvoker (fns, vm) {
          function invoker () {
            var arguments$1 = arguments;

            var fns = invoker.fns;
            if (Array.isArray(fns)) {
              var cloned = fns.slice();
              for (var i = 0; i < cloned.length; i++) {
                invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
              }
            } else {
              // return handler return value for single handlers
              return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
            }
          }
          invoker.fns = fns;
          return invoker
        }

        function updateListeners (
          on,
          oldOn,
          add,
          remove$$1,
          createOnceHandler,
          vm
        ) {
          var name, def$$1, cur, old, event;
          for (name in on) {
            def$$1 = cur = on[name];
            old = oldOn[name];
            event = normalizeEvent(name);
            if (isUndef(cur)) {
              warn(
                "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                vm
              );
            } else if (isUndef(old)) {
              if (isUndef(cur.fns)) {
                cur = on[name] = createFnInvoker(cur, vm);
              }
              if (isTrue(event.once)) {
                cur = on[name] = createOnceHandler(event.name, cur, event.capture);
              }
              add(event.name, cur, event.capture, event.passive, event.params);
            } else if (cur !== old) {
              old.fns = cur;
              on[name] = old;
            }
          }
          for (name in oldOn) {
            if (isUndef(on[name])) {
              event = normalizeEvent(name);
              remove$$1(event.name, oldOn[name], event.capture);
            }
          }
        }

        /*  */

        function mergeVNodeHook (def, hookKey, hook) {
          if (def instanceof VNode) {
            def = def.data.hook || (def.data.hook = {});
          }
          var invoker;
          var oldHook = def[hookKey];

          function wrappedHook () {
            hook.apply(this, arguments);
            // important: remove merged hook to ensure it's called only once
            // and prevent memory leak
            remove(invoker.fns, wrappedHook);
          }

          if (isUndef(oldHook)) {
            // no existing hook
            invoker = createFnInvoker([wrappedHook]);
          } else {
            /* istanbul ignore if */
            if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
              // already a merged invoker
              invoker = oldHook;
              invoker.fns.push(wrappedHook);
            } else {
              // existing plain hook
              invoker = createFnInvoker([oldHook, wrappedHook]);
            }
          }

          invoker.merged = true;
          def[hookKey] = invoker;
        }

        /*  */

        function extractPropsFromVNodeData (
          data,
          Ctor,
          tag
        ) {
          // we are only extracting raw values here.
          // validation and default values are handled in the child
          // component itself.
          var propOptions = Ctor.options.props;
          if (isUndef(propOptions)) {
            return
          }
          var res = {};
          var attrs = data.attrs;
          var props = data.props;
          if (isDef(attrs) || isDef(props)) {
            for (var key in propOptions) {
              var altKey = hyphenate(key);
              {
                var keyInLowerCase = key.toLowerCase();
                if (
                  key !== keyInLowerCase &&
                  attrs && hasOwn(attrs, keyInLowerCase)
                ) {
                  tip(
                    "Prop \"" + keyInLowerCase + "\" is passed to component " +
                    (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                    " \"" + key + "\". " +
                    "Note that HTML attributes are case-insensitive and camelCased " +
                    "props need to use their kebab-case equivalents when using in-DOM " +
                    "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
                  );
                }
              }
              checkProp(res, props, key, altKey, true) ||
                checkProp(res, attrs, key, altKey, false);
            }
          }
          return res
        }

        function checkProp (
          res,
          hash,
          key,
          altKey,
          preserve
        ) {
          if (isDef(hash)) {
            if (hasOwn(hash, key)) {
              res[key] = hash[key];
              if (!preserve) {
                delete hash[key];
              }
              return true
            } else if (hasOwn(hash, altKey)) {
              res[key] = hash[altKey];
              if (!preserve) {
                delete hash[altKey];
              }
              return true
            }
          }
          return false
        }

        /*  */

        // The template compiler attempts to minimize the need for normalization by
        // statically analyzing the template at compile time.
        //
        // For plain HTML markup, normalization can be completely skipped because the
        // generated render function is guaranteed to return Array<VNode>. There are
        // two cases where extra normalization is needed:

        // 1. When the children contains components - because a functional component
        // may return an Array instead of a single root. In this case, just a simple
        // normalization is needed - if any child is an Array, we flatten the whole
        // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
        // because functional components already normalize their own children.
        function simpleNormalizeChildren (children) {
          for (var i = 0; i < children.length; i++) {
            if (Array.isArray(children[i])) {
              return Array.prototype.concat.apply([], children)
            }
          }
          return children
        }

        // 2. When the children contains constructs that always generated nested Arrays,
        // e.g. <template>, <slot>, v-for, or when the children is provided by user
        // with hand-written render functions / JSX. In such cases a full normalization
        // is needed to cater to all possible types of children values.
        function normalizeChildren (children) {
          return isPrimitive(children)
            ? [createTextVNode(children)]
            : Array.isArray(children)
              ? normalizeArrayChildren(children)
              : undefined
        }

        function isTextNode (node) {
          return isDef(node) && isDef(node.text) && isFalse(node.isComment)
        }

        function normalizeArrayChildren (children, nestedIndex) {
          var res = [];
          var i, c, lastIndex, last;
          for (i = 0; i < children.length; i++) {
            c = children[i];
            if (isUndef(c) || typeof c === 'boolean') { continue }
            lastIndex = res.length - 1;
            last = res[lastIndex];
            //  nested
            if (Array.isArray(c)) {
              if (c.length > 0) {
                c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
                // merge adjacent text nodes
                if (isTextNode(c[0]) && isTextNode(last)) {
                  res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                  c.shift();
                }
                res.push.apply(res, c);
              }
            } else if (isPrimitive(c)) {
              if (isTextNode(last)) {
                // merge adjacent text nodes
                // this is necessary for SSR hydration because text nodes are
                // essentially merged when rendered to HTML strings
                res[lastIndex] = createTextVNode(last.text + c);
              } else if (c !== '') {
                // convert primitive to vnode
                res.push(createTextVNode(c));
              }
            } else {
              if (isTextNode(c) && isTextNode(last)) {
                // merge adjacent text nodes
                res[lastIndex] = createTextVNode(last.text + c.text);
              } else {
                // default key for nested array children (likely generated by v-for)
                if (isTrue(children._isVList) &&
                  isDef(c.tag) &&
                  isUndef(c.key) &&
                  isDef(nestedIndex)) {
                  c.key = "__vlist" + nestedIndex + "_" + i + "__";
                }
                res.push(c);
              }
            }
          }
          return res
        }

        /*  */

        function initProvide (vm) {
          var provide = vm.$options.provide;
          if (provide) {
            vm._provided = typeof provide === 'function'
              ? provide.call(vm)
              : provide;
          }
        }

        function initInjections (vm) {
          var result = resolveInject(vm.$options.inject, vm);
          if (result) {
            toggleObserving(false);
            Object.keys(result).forEach(function (key) {
              /* istanbul ignore else */
              {
                defineReactive$$1(vm, key, result[key], function () {
                  warn(
                    "Avoid mutating an injected value directly since the changes will be " +
                    "overwritten whenever the provided component re-renders. " +
                    "injection being mutated: \"" + key + "\"",
                    vm
                  );
                });
              }
            });
            toggleObserving(true);
          }
        }

        function resolveInject (inject, vm) {
          if (inject) {
            // inject is :any because flow is not smart enough to figure out cached
            var result = Object.create(null);
            var keys = hasSymbol
              ? Reflect.ownKeys(inject)
              : Object.keys(inject);

            for (var i = 0; i < keys.length; i++) {
              var key = keys[i];
              // #6574 in case the inject object is observed...
              if (key === '__ob__') { continue }
              var provideKey = inject[key].from;
              var source = vm;
              while (source) {
                if (source._provided && hasOwn(source._provided, provideKey)) {
                  result[key] = source._provided[provideKey];
                  break
                }
                source = source.$parent;
              }
              if (!source) {
                if ('default' in inject[key]) {
                  var provideDefault = inject[key].default;
                  result[key] = typeof provideDefault === 'function'
                    ? provideDefault.call(vm)
                    : provideDefault;
                } else {
                  warn(("Injection \"" + key + "\" not found"), vm);
                }
              }
            }
            return result
          }
        }

        /*  */



        /**
         * Runtime helper for resolving raw children VNodes into a slot object.
         */
        function resolveSlots (
          children,
          context
        ) {
          if (!children || !children.length) {
            return {}
          }
          var slots = {};
          for (var i = 0, l = children.length; i < l; i++) {
            var child = children[i];
            var data = child.data;
            // remove slot attribute if the node is resolved as a Vue slot node
            if (data && data.attrs && data.attrs.slot) {
              delete data.attrs.slot;
            }
            // named slots should only be respected if the vnode was rendered in the
            // same context.
            if ((child.context === context || child.fnContext === context) &&
              data && data.slot != null
            ) {
              var name = data.slot;
              var slot = (slots[name] || (slots[name] = []));
              if (child.tag === 'template') {
                slot.push.apply(slot, child.children || []);
              } else {
                slot.push(child);
              }
            } else {
              (slots.default || (slots.default = [])).push(child);
            }
          }
          // ignore slots that contains only whitespace
          for (var name$1 in slots) {
            if (slots[name$1].every(isWhitespace)) {
              delete slots[name$1];
            }
          }
          return slots
        }

        function isWhitespace (node) {
          return (node.isComment && !node.asyncFactory) || node.text === ' '
        }

        /*  */

        function isAsyncPlaceholder (node) {
          return node.isComment && node.asyncFactory
        }

        /*  */

        function normalizeScopedSlots (
          slots,
          normalSlots,
          prevSlots
        ) {
          var res;
          var hasNormalSlots = Object.keys(normalSlots).length > 0;
          var isStable = slots ? !!slots.$stable : !hasNormalSlots;
          var key = slots && slots.$key;
          if (!slots) {
            res = {};
          } else if (slots._normalized) {
            // fast path 1: child component re-render only, parent did not change
            return slots._normalized
          } else if (
            isStable &&
            prevSlots &&
            prevSlots !== emptyObject &&
            key === prevSlots.$key &&
            !hasNormalSlots &&
            !prevSlots.$hasNormal
          ) {
            // fast path 2: stable scoped slots w/ no normal slots to proxy,
            // only need to normalize once
            return prevSlots
          } else {
            res = {};
            for (var key$1 in slots) {
              if (slots[key$1] && key$1[0] !== '$') {
                res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
              }
            }
          }
          // expose normal slots on scopedSlots
          for (var key$2 in normalSlots) {
            if (!(key$2 in res)) {
              res[key$2] = proxyNormalSlot(normalSlots, key$2);
            }
          }
          // avoriaz seems to mock a non-extensible $scopedSlots object
          // and when that is passed down this would cause an error
          if (slots && Object.isExtensible(slots)) {
            (slots)._normalized = res;
          }
          def(res, '$stable', isStable);
          def(res, '$key', key);
          def(res, '$hasNormal', hasNormalSlots);
          return res
        }

        function normalizeScopedSlot (normalSlots, key, fn) {
          var normalized = function () {
            var res = arguments.length ? fn.apply(null, arguments) : fn({});
            res = res && typeof res === 'object' && !Array.isArray(res)
              ? [res] // single vnode
              : normalizeChildren(res);
            var vnode = res && res[0];
            return res && (
              !vnode ||
              (res.length === 1 && vnode.isComment && !isAsyncPlaceholder(vnode)) // #9658, #10391
            ) ? undefined
              : res
          };
          // this is a slot using the new v-slot syntax without scope. although it is
          // compiled as a scoped slot, render fn users would expect it to be present
          // on this.$slots because the usage is semantically a normal slot.
          if (fn.proxy) {
            Object.defineProperty(normalSlots, key, {
              get: normalized,
              enumerable: true,
              configurable: true
            });
          }
          return normalized
        }

        function proxyNormalSlot (slots, key) {
          return function () { return slots[key]; }
        }

        /*  */

        /**
         * Runtime helper for rendering v-for lists.
         */
        function renderList (
          val,
          render
        ) {
          var ret, i, l, keys, key;
          if (Array.isArray(val) || typeof val === 'string') {
            ret = new Array(val.length);
            for (i = 0, l = val.length; i < l; i++) {
              ret[i] = render(val[i], i);
            }
          } else if (typeof val === 'number') {
            ret = new Array(val);
            for (i = 0; i < val; i++) {
              ret[i] = render(i + 1, i);
            }
          } else if (isObject(val)) {
            if (hasSymbol && val[Symbol.iterator]) {
              ret = [];
              var iterator = val[Symbol.iterator]();
              var result = iterator.next();
              while (!result.done) {
                ret.push(render(result.value, ret.length));
                result = iterator.next();
              }
            } else {
              keys = Object.keys(val);
              ret = new Array(keys.length);
              for (i = 0, l = keys.length; i < l; i++) {
                key = keys[i];
                ret[i] = render(val[key], key, i);
              }
            }
          }
          if (!isDef(ret)) {
            ret = [];
          }
          (ret)._isVList = true;
          return ret
        }

        /*  */

        /**
         * Runtime helper for rendering <slot>
         */
        function renderSlot (
          name,
          fallbackRender,
          props,
          bindObject
        ) {
          var scopedSlotFn = this.$scopedSlots[name];
          var nodes;
          if (scopedSlotFn) {
            // scoped slot
            props = props || {};
            if (bindObject) {
              if (!isObject(bindObject)) {
                warn('slot v-bind without argument expects an Object', this);
              }
              props = extend(extend({}, bindObject), props);
            }
            nodes =
              scopedSlotFn(props) ||
              (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender);
          } else {
            nodes =
              this.$slots[name] ||
              (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender);
          }

          var target = props && props.slot;
          if (target) {
            return this.$createElement('template', { slot: target }, nodes)
          } else {
            return nodes
          }
        }

        /*  */

        /**
         * Runtime helper for resolving filters
         */
        function resolveFilter (id) {
          return resolveAsset(this.$options, 'filters', id, true) || identity
        }

        /*  */

        function isKeyNotMatch (expect, actual) {
          if (Array.isArray(expect)) {
            return expect.indexOf(actual) === -1
          } else {
            return expect !== actual
          }
        }

        /**
         * Runtime helper for checking keyCodes from config.
         * exposed as Vue.prototype._k
         * passing in eventKeyName as last argument separately for backwards compat
         */
        function checkKeyCodes (
          eventKeyCode,
          key,
          builtInKeyCode,
          eventKeyName,
          builtInKeyName
        ) {
          var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
          if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
            return isKeyNotMatch(builtInKeyName, eventKeyName)
          } else if (mappedKeyCode) {
            return isKeyNotMatch(mappedKeyCode, eventKeyCode)
          } else if (eventKeyName) {
            return hyphenate(eventKeyName) !== key
          }
          return eventKeyCode === undefined
        }

        /*  */

        /**
         * Runtime helper for merging v-bind="object" into a VNode's data.
         */
        function bindObjectProps (
          data,
          tag,
          value,
          asProp,
          isSync
        ) {
          if (value) {
            if (!isObject(value)) {
              warn(
                'v-bind without argument expects an Object or Array value',
                this
              );
            } else {
              if (Array.isArray(value)) {
                value = toObject(value);
              }
              var hash;
              var loop = function (key) {
                if (
                  key === 'class' ||
                  key === 'style' ||
                  isReservedAttribute(key)
                ) {
                  hash = data;
                } else {
                  var type = data.attrs && data.attrs.type;
                  hash = asProp || config.mustUseProp(tag, type, key)
                    ? data.domProps || (data.domProps = {})
                    : data.attrs || (data.attrs = {});
                }
                var camelizedKey = camelize(key);
                var hyphenatedKey = hyphenate(key);
                if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
                  hash[key] = value[key];

                  if (isSync) {
                    var on = data.on || (data.on = {});
                    on[("update:" + key)] = function ($event) {
                      value[key] = $event;
                    };
                  }
                }
              };

              for (var key in value) loop(key);
            }
          }
          return data
        }

        /*  */

        /**
         * Runtime helper for rendering static trees.
         */
        function renderStatic (
          index,
          isInFor
        ) {
          var cached = this._staticTrees || (this._staticTrees = []);
          var tree = cached[index];
          // if has already-rendered static tree and not inside v-for,
          // we can reuse the same tree.
          if (tree && !isInFor) {
            return tree
          }
          // otherwise, render a fresh tree.
          tree = cached[index] = this.$options.staticRenderFns[index].call(
            this._renderProxy,
            null,
            this // for render fns generated for functional component templates
          );
          markStatic(tree, ("__static__" + index), false);
          return tree
        }

        /**
         * Runtime helper for v-once.
         * Effectively it means marking the node as static with a unique key.
         */
        function markOnce (
          tree,
          index,
          key
        ) {
          markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
          return tree
        }

        function markStatic (
          tree,
          key,
          isOnce
        ) {
          if (Array.isArray(tree)) {
            for (var i = 0; i < tree.length; i++) {
              if (tree[i] && typeof tree[i] !== 'string') {
                markStaticNode(tree[i], (key + "_" + i), isOnce);
              }
            }
          } else {
            markStaticNode(tree, key, isOnce);
          }
        }

        function markStaticNode (node, key, isOnce) {
          node.isStatic = true;
          node.key = key;
          node.isOnce = isOnce;
        }

        /*  */

        function bindObjectListeners (data, value) {
          if (value) {
            if (!isPlainObject(value)) {
              warn(
                'v-on without argument expects an Object value',
                this
              );
            } else {
              var on = data.on = data.on ? extend({}, data.on) : {};
              for (var key in value) {
                var existing = on[key];
                var ours = value[key];
                on[key] = existing ? [].concat(existing, ours) : ours;
              }
            }
          }
          return data
        }

        /*  */

        function resolveScopedSlots (
          fns, // see flow/vnode
          res,
          // the following are added in 2.6
          hasDynamicKeys,
          contentHashKey
        ) {
          res = res || { $stable: !hasDynamicKeys };
          for (var i = 0; i < fns.length; i++) {
            var slot = fns[i];
            if (Array.isArray(slot)) {
              resolveScopedSlots(slot, res, hasDynamicKeys);
            } else if (slot) {
              // marker for reverse proxying v-slot without scope on this.$slots
              if (slot.proxy) {
                slot.fn.proxy = true;
              }
              res[slot.key] = slot.fn;
            }
          }
          if (contentHashKey) {
            (res).$key = contentHashKey;
          }
          return res
        }

        /*  */

        function bindDynamicKeys (baseObj, values) {
          for (var i = 0; i < values.length; i += 2) {
            var key = values[i];
            if (typeof key === 'string' && key) {
              baseObj[values[i]] = values[i + 1];
            } else if (key !== '' && key !== null) {
              // null is a special value for explicitly removing a binding
              warn(
                ("Invalid value for dynamic directive argument (expected string or null): " + key),
                this
              );
            }
          }
          return baseObj
        }

        // helper to dynamically append modifier runtime markers to event names.
        // ensure only append when value is already string, otherwise it will be cast
        // to string and cause the type check to miss.
        function prependModifier (value, symbol) {
          return typeof value === 'string' ? symbol + value : value
        }

        /*  */

        function installRenderHelpers (target) {
          target._o = markOnce;
          target._n = toNumber;
          target._s = toString;
          target._l = renderList;
          target._t = renderSlot;
          target._q = looseEqual;
          target._i = looseIndexOf;
          target._m = renderStatic;
          target._f = resolveFilter;
          target._k = checkKeyCodes;
          target._b = bindObjectProps;
          target._v = createTextVNode;
          target._e = createEmptyVNode;
          target._u = resolveScopedSlots;
          target._g = bindObjectListeners;
          target._d = bindDynamicKeys;
          target._p = prependModifier;
        }

        /*  */

        function FunctionalRenderContext (
          data,
          props,
          children,
          parent,
          Ctor
        ) {
          var this$1 = this;

          var options = Ctor.options;
          // ensure the createElement function in functional components
          // gets a unique context - this is necessary for correct named slot check
          var contextVm;
          if (hasOwn(parent, '_uid')) {
            contextVm = Object.create(parent);
            // $flow-disable-line
            contextVm._original = parent;
          } else {
            // the context vm passed in is a functional context as well.
            // in this case we want to make sure we are able to get a hold to the
            // real context instance.
            contextVm = parent;
            // $flow-disable-line
            parent = parent._original;
          }
          var isCompiled = isTrue(options._compiled);
          var needNormalization = !isCompiled;

          this.data = data;
          this.props = props;
          this.children = children;
          this.parent = parent;
          this.listeners = data.on || emptyObject;
          this.injections = resolveInject(options.inject, parent);
          this.slots = function () {
            if (!this$1.$slots) {
              normalizeScopedSlots(
                data.scopedSlots,
                this$1.$slots = resolveSlots(children, parent)
              );
            }
            return this$1.$slots
          };

          Object.defineProperty(this, 'scopedSlots', ({
            enumerable: true,
            get: function get () {
              return normalizeScopedSlots(data.scopedSlots, this.slots())
            }
          }));

          // support for compiled functional template
          if (isCompiled) {
            // exposing $options for renderStatic()
            this.$options = options;
            // pre-resolve slots for renderSlot()
            this.$slots = this.slots();
            this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
          }

          if (options._scopeId) {
            this._c = function (a, b, c, d) {
              var vnode = createElement(contextVm, a, b, c, d, needNormalization);
              if (vnode && !Array.isArray(vnode)) {
                vnode.fnScopeId = options._scopeId;
                vnode.fnContext = parent;
              }
              return vnode
            };
          } else {
            this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
          }
        }

        installRenderHelpers(FunctionalRenderContext.prototype);

        function createFunctionalComponent (
          Ctor,
          propsData,
          data,
          contextVm,
          children
        ) {
          var options = Ctor.options;
          var props = {};
          var propOptions = options.props;
          if (isDef(propOptions)) {
            for (var key in propOptions) {
              props[key] = validateProp(key, propOptions, propsData || emptyObject);
            }
          } else {
            if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
            if (isDef(data.props)) { mergeProps(props, data.props); }
          }

          var renderContext = new FunctionalRenderContext(
            data,
            props,
            children,
            contextVm,
            Ctor
          );

          var vnode = options.render.call(null, renderContext._c, renderContext);

          if (vnode instanceof VNode) {
            return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
          } else if (Array.isArray(vnode)) {
            var vnodes = normalizeChildren(vnode) || [];
            var res = new Array(vnodes.length);
            for (var i = 0; i < vnodes.length; i++) {
              res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
            }
            return res
          }
        }

        function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
          // #7817 clone node before setting fnContext, otherwise if the node is reused
          // (e.g. it was from a cached normal slot) the fnContext causes named slots
          // that should not be matched to match.
          var clone = cloneVNode(vnode);
          clone.fnContext = contextVm;
          clone.fnOptions = options;
          {
            (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
          }
          if (data.slot) {
            (clone.data || (clone.data = {})).slot = data.slot;
          }
          return clone
        }

        function mergeProps (to, from) {
          for (var key in from) {
            to[camelize(key)] = from[key];
          }
        }

        /*  */

        /*  */

        /*  */

        /*  */

        // inline hooks to be invoked on component VNodes during patch
        var componentVNodeHooks = {
          init: function init (vnode, hydrating) {
            if (
              vnode.componentInstance &&
              !vnode.componentInstance._isDestroyed &&
              vnode.data.keepAlive
            ) {
              // kept-alive components, treat as a patch
              var mountedNode = vnode; // work around flow
              componentVNodeHooks.prepatch(mountedNode, mountedNode);
            } else {
              var child = vnode.componentInstance = createComponentInstanceForVnode(
                vnode,
                activeInstance
              );
              child.$mount(hydrating ? vnode.elm : undefined, hydrating);
            }
          },

          prepatch: function prepatch (oldVnode, vnode) {
            var options = vnode.componentOptions;
            var child = vnode.componentInstance = oldVnode.componentInstance;
            updateChildComponent(
              child,
              options.propsData, // updated props
              options.listeners, // updated listeners
              vnode, // new parent vnode
              options.children // new children
            );
          },

          insert: function insert (vnode) {
            var context = vnode.context;
            var componentInstance = vnode.componentInstance;
            if (!componentInstance._isMounted) {
              componentInstance._isMounted = true;
              callHook(componentInstance, 'mounted');
            }
            if (vnode.data.keepAlive) {
              if (context._isMounted) {
                // vue-router#1212
                // During updates, a kept-alive component's child components may
                // change, so directly walking the tree here may call activated hooks
                // on incorrect children. Instead we push them into a queue which will
                // be processed after the whole patch process ended.
                queueActivatedComponent(componentInstance);
              } else {
                activateChildComponent(componentInstance, true /* direct */);
              }
            }
          },

          destroy: function destroy (vnode) {
            var componentInstance = vnode.componentInstance;
            if (!componentInstance._isDestroyed) {
              if (!vnode.data.keepAlive) {
                componentInstance.$destroy();
              } else {
                deactivateChildComponent(componentInstance, true /* direct */);
              }
            }
          }
        };

        var hooksToMerge = Object.keys(componentVNodeHooks);

        function createComponent (
          Ctor,
          data,
          context,
          children,
          tag
        ) {
          if (isUndef(Ctor)) {
            return
          }

          var baseCtor = context.$options._base;

          // plain options object: turn it into a constructor
          if (isObject(Ctor)) {
            Ctor = baseCtor.extend(Ctor);
          }

          // if at this stage it's not a constructor or an async component factory,
          // reject.
          if (typeof Ctor !== 'function') {
            {
              warn(("Invalid Component definition: " + (String(Ctor))), context);
            }
            return
          }

          // async component
          var asyncFactory;
          if (isUndef(Ctor.cid)) {
            asyncFactory = Ctor;
            Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
            if (Ctor === undefined) {
              // return a placeholder node for async component, which is rendered
              // as a comment node but preserves all the raw information for the node.
              // the information will be used for async server-rendering and hydration.
              return createAsyncPlaceholder(
                asyncFactory,
                data,
                context,
                children,
                tag
              )
            }
          }

          data = data || {};

          // resolve constructor options in case global mixins are applied after
          // component constructor creation
          resolveConstructorOptions(Ctor);

          // transform component v-model data into props & events
          if (isDef(data.model)) {
            transformModel(Ctor.options, data);
          }

          // extract props
          var propsData = extractPropsFromVNodeData(data, Ctor, tag);

          // functional component
          if (isTrue(Ctor.options.functional)) {
            return createFunctionalComponent(Ctor, propsData, data, context, children)
          }

          // extract listeners, since these needs to be treated as
          // child component listeners instead of DOM listeners
          var listeners = data.on;
          // replace with listeners with .native modifier
          // so it gets processed during parent component patch.
          data.on = data.nativeOn;

          if (isTrue(Ctor.options.abstract)) {
            // abstract components do not keep anything
            // other than props & listeners & slot

            // work around flow
            var slot = data.slot;
            data = {};
            if (slot) {
              data.slot = slot;
            }
          }

          // install component management hooks onto the placeholder node
          installComponentHooks(data);

          // return a placeholder vnode
          var name = Ctor.options.name || tag;
          var vnode = new VNode(
            ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
            data, undefined, undefined, undefined, context,
            { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
            asyncFactory
          );

          return vnode
        }

        function createComponentInstanceForVnode (
          // we know it's MountedComponentVNode but flow doesn't
          vnode,
          // activeInstance in lifecycle state
          parent
        ) {
          var options = {
            _isComponent: true,
            _parentVnode: vnode,
            parent: parent
          };
          // check inline-template render functions
          var inlineTemplate = vnode.data.inlineTemplate;
          if (isDef(inlineTemplate)) {
            options.render = inlineTemplate.render;
            options.staticRenderFns = inlineTemplate.staticRenderFns;
          }
          return new vnode.componentOptions.Ctor(options)
        }

        function installComponentHooks (data) {
          var hooks = data.hook || (data.hook = {});
          for (var i = 0; i < hooksToMerge.length; i++) {
            var key = hooksToMerge[i];
            var existing = hooks[key];
            var toMerge = componentVNodeHooks[key];
            if (existing !== toMerge && !(existing && existing._merged)) {
              hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
            }
          }
        }

        function mergeHook$1 (f1, f2) {
          var merged = function (a, b) {
            // flow complains about extra args which is why we use any
            f1(a, b);
            f2(a, b);
          };
          merged._merged = true;
          return merged
        }

        // transform component v-model info (value and callback) into
        // prop and event handler respectively.
        function transformModel (options, data) {
          var prop = (options.model && options.model.prop) || 'value';
          var event = (options.model && options.model.event) || 'input'
            ; (data.attrs || (data.attrs = {}))[prop] = data.model.value;
          var on = data.on || (data.on = {});
          var existing = on[event];
          var callback = data.model.callback;
          if (isDef(existing)) {
            if (
              Array.isArray(existing)
                ? existing.indexOf(callback) === -1
                : existing !== callback
            ) {
              on[event] = [callback].concat(existing);
            }
          } else {
            on[event] = callback;
          }
        }

        /*  */

        var SIMPLE_NORMALIZE = 1;
        var ALWAYS_NORMALIZE = 2;

        // wrapper function for providing a more flexible interface
        // without getting yelled at by flow
        function createElement (
          context,
          tag,
          data,
          children,
          normalizationType,
          alwaysNormalize
        ) {
          if (Array.isArray(data) || isPrimitive(data)) {
            normalizationType = children;
            children = data;
            data = undefined;
          }
          if (isTrue(alwaysNormalize)) {
            normalizationType = ALWAYS_NORMALIZE;
          }
          return _createElement(context, tag, data, children, normalizationType)
        }

        function _createElement (
          context,
          tag,
          data,
          children,
          normalizationType
        ) {
          if (isDef(data) && isDef((data).__ob__)) {
            warn(
              "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
              'Always create fresh vnode data objects in each render!',
              context
            );
            return createEmptyVNode()
          }
          // object syntax in v-bind
          if (isDef(data) && isDef(data.is)) {
            tag = data.is;
          }
          if (!tag) {
            // in case of component :is set to falsy value
            return createEmptyVNode()
          }
          // warn against non-primitive key
          if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
          ) {
            {
              warn(
                'Avoid using non-primitive value as key, ' +
                'use string/number value instead.',
                context
              );
            }
          }
          // support single function children as default scoped slot
          if (Array.isArray(children) &&
            typeof children[0] === 'function'
          ) {
            data = data || {};
            data.scopedSlots = { default: children[0] };
            children.length = 0;
          }
          if (normalizationType === ALWAYS_NORMALIZE) {
            children = normalizeChildren(children);
          } else if (normalizationType === SIMPLE_NORMALIZE) {
            children = simpleNormalizeChildren(children);
          }
          var vnode, ns;
          if (typeof tag === 'string') {
            var Ctor;
            ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
            if (config.isReservedTag(tag)) {
              // platform built-in elements
              if (isDef(data) && isDef(data.nativeOn) && data.tag !== 'component') {
                warn(
                  ("The .native modifier for v-on is only valid on components but it was used on <" + tag + ">."),
                  context
                );
              }
              vnode = new VNode(
                config.parsePlatformTagName(tag), data, children,
                undefined, undefined, context
              );
            } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
              // component
              vnode = createComponent(Ctor, data, context, children, tag);
            } else {
              // unknown or unlisted namespaced elements
              // check at runtime because it may get assigned a namespace when its
              // parent normalizes children
              vnode = new VNode(
                tag, data, children,
                undefined, undefined, context
              );
            }
          } else {
            // direct component options / constructor
            vnode = createComponent(tag, data, context, children);
          }
          if (Array.isArray(vnode)) {
            return vnode
          } else if (isDef(vnode)) {
            if (isDef(ns)) { applyNS(vnode, ns); }
            if (isDef(data)) { registerDeepBindings(data); }
            return vnode
          } else {
            return createEmptyVNode()
          }
        }

        function applyNS (vnode, ns, force) {
          vnode.ns = ns;
          if (vnode.tag === 'foreignObject') {
            // use default namespace inside foreignObject
            ns = undefined;
            force = true;
          }
          if (isDef(vnode.children)) {
            for (var i = 0, l = vnode.children.length; i < l; i++) {
              var child = vnode.children[i];
              if (isDef(child.tag) && (
                isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
                applyNS(child, ns, force);
              }
            }
          }
        }

        // ref #5318
        // necessary to ensure parent re-render when deep bindings like :style and
        // :class are used on slot nodes
        function registerDeepBindings (data) {
          if (isObject(data.style)) {
            traverse(data.style);
          }
          if (isObject(data.class)) {
            traverse(data.class);
          }
        }

        /*  */

        function initRender (vm) {
          vm._vnode = null; // the root of the child tree
          vm._staticTrees = null; // v-once cached trees
          var options = vm.$options;
          var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
          var renderContext = parentVnode && parentVnode.context;
          vm.$slots = resolveSlots(options._renderChildren, renderContext);
          vm.$scopedSlots = emptyObject;
          // bind the createElement fn to this instance
          // so that we get proper render context inside it.
          // args order: tag, data, children, normalizationType, alwaysNormalize
          // internal version is used by render functions compiled from templates
          vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
          // normalization is always applied for the public version, used in
          // user-written render functions.
          vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };

          // $attrs & $listeners are exposed for easier HOC creation.
          // they need to be reactive so that HOCs using them are always updated
          var parentData = parentVnode && parentVnode.data;

          /* istanbul ignore else */
          {
            defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
              !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
            }, true);
            defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
              !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
            }, true);
          }
        }

        var currentRenderingInstance = null;

        function renderMixin (Vue) {
          // install runtime convenience helpers
          installRenderHelpers(Vue.prototype);

          Vue.prototype.$nextTick = function (fn) {
            return nextTick(fn, this)
          };

          Vue.prototype._render = function () {
            var vm = this;
            var ref = vm.$options;
            var render = ref.render;
            var _parentVnode = ref._parentVnode;

            if (_parentVnode) {
              vm.$scopedSlots = normalizeScopedSlots(
                _parentVnode.data.scopedSlots,
                vm.$slots,
                vm.$scopedSlots
              );
            }

            // set parent vnode. this allows render functions to have access
            // to the data on the placeholder node.
            vm.$vnode = _parentVnode;
            // render self
            var vnode;
            try {
              // There's no need to maintain a stack because all render fns are called
              // separately from one another. Nested component's render fns are called
              // when parent component is patched.
              currentRenderingInstance = vm;
              vnode = render.call(vm._renderProxy, vm.$createElement);
            } catch (e) {
              handleError(e, vm, "render");
              // return error render result,
              // or previous vnode to prevent render error causing blank component
              /* istanbul ignore else */
              if (vm.$options.renderError) {
                try {
                  vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                } catch (e) {
                  handleError(e, vm, "renderError");
                  vnode = vm._vnode;
                }
              } else {
                vnode = vm._vnode;
              }
            } finally {
              currentRenderingInstance = null;
            }
            // if the returned array contains only a single node, allow it
            if (Array.isArray(vnode) && vnode.length === 1) {
              vnode = vnode[0];
            }
            // return empty vnode in case the render function errored out
            if (!(vnode instanceof VNode)) {
              if (Array.isArray(vnode)) {
                warn(
                  'Multiple root nodes returned from render function. Render function ' +
                  'should return a single root node.',
                  vm
                );
              }
              vnode = createEmptyVNode();
            }
            // set parent
            vnode.parent = _parentVnode;
            return vnode
          };
        }

        /*  */

        function ensureCtor (comp, base) {
          if (
            comp.__esModule ||
            (hasSymbol && comp[Symbol.toStringTag] === 'Module')
          ) {
            comp = comp.default;
          }
          return isObject(comp)
            ? base.extend(comp)
            : comp
        }

        function createAsyncPlaceholder (
          factory,
          data,
          context,
          children,
          tag
        ) {
          var node = createEmptyVNode();
          node.asyncFactory = factory;
          node.asyncMeta = { data: data, context: context, children: children, tag: tag };
          return node
        }

        function resolveAsyncComponent (
          factory,
          baseCtor
        ) {
          if (isTrue(factory.error) && isDef(factory.errorComp)) {
            return factory.errorComp
          }

          if (isDef(factory.resolved)) {
            return factory.resolved
          }

          var owner = currentRenderingInstance;
          if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
            // already pending
            factory.owners.push(owner);
          }

          if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
            return factory.loadingComp
          }

          if (owner && !isDef(factory.owners)) {
            var owners = factory.owners = [owner];
            var sync = true;
            var timerLoading = null;
            var timerTimeout = null

              ; (owner).$on('hook:destroyed', function () { return remove(owners, owner); });

            var forceRender = function (renderCompleted) {
              for (var i = 0, l = owners.length; i < l; i++) {
                (owners[i]).$forceUpdate();
              }

              if (renderCompleted) {
                owners.length = 0;
                if (timerLoading !== null) {
                  clearTimeout(timerLoading);
                  timerLoading = null;
                }
                if (timerTimeout !== null) {
                  clearTimeout(timerTimeout);
                  timerTimeout = null;
                }
              }
            };

            var resolve = once(function (res) {
              // cache resolved
              factory.resolved = ensureCtor(res, baseCtor);
              // invoke callbacks only if this is not a synchronous resolve
              // (async resolves are shimmed as synchronous during SSR)
              if (!sync) {
                forceRender(true);
              } else {
                owners.length = 0;
              }
            });

            var reject = once(function (reason) {
              warn(
                "Failed to resolve async component: " + (String(factory)) +
                (reason ? ("\nReason: " + reason) : '')
              );
              if (isDef(factory.errorComp)) {
                factory.error = true;
                forceRender(true);
              }
            });

            var res = factory(resolve, reject);

            if (isObject(res)) {
              if (isPromise(res)) {
                // () => Promise
                if (isUndef(factory.resolved)) {
                  res.then(resolve, reject);
                }
              } else if (isPromise(res.component)) {
                res.component.then(resolve, reject);

                if (isDef(res.error)) {
                  factory.errorComp = ensureCtor(res.error, baseCtor);
                }

                if (isDef(res.loading)) {
                  factory.loadingComp = ensureCtor(res.loading, baseCtor);
                  if (res.delay === 0) {
                    factory.loading = true;
                  } else {
                    timerLoading = setTimeout(function () {
                      timerLoading = null;
                      if (isUndef(factory.resolved) && isUndef(factory.error)) {
                        factory.loading = true;
                        forceRender(false);
                      }
                    }, res.delay || 200);
                  }
                }

                if (isDef(res.timeout)) {
                  timerTimeout = setTimeout(function () {
                    timerTimeout = null;
                    if (isUndef(factory.resolved)) {
                      reject(
                        "timeout (" + (res.timeout) + "ms)"
                      );
                    }
                  }, res.timeout);
                }
              }
            }

            sync = false;
            // return in case resolved synchronously
            return factory.loading
              ? factory.loadingComp
              : factory.resolved
          }
        }

        /*  */

        function getFirstComponentChild (children) {
          if (Array.isArray(children)) {
            for (var i = 0; i < children.length; i++) {
              var c = children[i];
              if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                return c
              }
            }
          }
        }

        /*  */

        /*  */

        function initEvents (vm) {
          vm._events = Object.create(null);
          vm._hasHookEvent = false;
          // init parent attached events
          var listeners = vm.$options._parentListeners;
          if (listeners) {
            updateComponentListeners(vm, listeners);
          }
        }

        var target;

        function add (event, fn) {
          target.$on(event, fn);
        }

        function remove$1 (event, fn) {
          target.$off(event, fn);
        }

        function createOnceHandler (event, fn) {
          var _target = target;
          return function onceHandler () {
            var res = fn.apply(null, arguments);
            if (res !== null) {
              _target.$off(event, onceHandler);
            }
          }
        }

        function updateComponentListeners (
          vm,
          listeners,
          oldListeners
        ) {
          target = vm;
          updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
          target = undefined;
        }

        function eventsMixin (Vue) {
          var hookRE = /^hook:/;
          Vue.prototype.$on = function (event, fn) {
            var vm = this;
            if (Array.isArray(event)) {
              for (var i = 0, l = event.length; i < l; i++) {
                vm.$on(event[i], fn);
              }
            } else {
              (vm._events[event] || (vm._events[event] = [])).push(fn);
              // optimize hook:event cost by using a boolean flag marked at registration
              // instead of a hash lookup
              if (hookRE.test(event)) {
                vm._hasHookEvent = true;
              }
            }
            return vm
          };

          Vue.prototype.$once = function (event, fn) {
            var vm = this;
            function on () {
              vm.$off(event, on);
              fn.apply(vm, arguments);
            }
            on.fn = fn;
            vm.$on(event, on);
            return vm
          };

          Vue.prototype.$off = function (event, fn) {
            var vm = this;
            // all
            if (!arguments.length) {
              vm._events = Object.create(null);
              return vm
            }
            // array of events
            if (Array.isArray(event)) {
              for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
                vm.$off(event[i$1], fn);
              }
              return vm
            }
            // specific event
            var cbs = vm._events[event];
            if (!cbs) {
              return vm
            }
            if (!fn) {
              vm._events[event] = null;
              return vm
            }
            // specific handler
            var cb;
            var i = cbs.length;
            while (i--) {
              cb = cbs[i];
              if (cb === fn || cb.fn === fn) {
                cbs.splice(i, 1);
                break
              }
            }
            return vm
          };

          Vue.prototype.$emit = function (event) {
            var vm = this;
            {
              var lowerCaseEvent = event.toLowerCase();
              if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                tip(
                  "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                  (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                  "Note that HTML attributes are case-insensitive and you cannot use " +
                  "v-on to listen to camelCase events when using in-DOM templates. " +
                  "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                );
              }
            }
            var cbs = vm._events[event];
            if (cbs) {
              cbs = cbs.length > 1 ? toArray(cbs) : cbs;
              var args = toArray(arguments, 1);
              var info = "event handler for \"" + event + "\"";
              for (var i = 0, l = cbs.length; i < l; i++) {
                invokeWithErrorHandling(cbs[i], vm, args, vm, info);
              }
            }
            return vm
          };
        }

        /*  */

        var activeInstance = null;
        var isUpdatingChildComponent = false;

        function setActiveInstance (vm) {
          var prevActiveInstance = activeInstance;
          activeInstance = vm;
          return function () {
            activeInstance = prevActiveInstance;
          }
        }

        function initLifecycle (vm) {
          var options = vm.$options;

          // locate first non-abstract parent
          var parent = options.parent;
          if (parent && !options.abstract) {
            while (parent.$options.abstract && parent.$parent) {
              parent = parent.$parent;
            }
            parent.$children.push(vm);
          }

          vm.$parent = parent;
          vm.$root = parent ? parent.$root : vm;

          vm.$children = [];
          vm.$refs = {};

          vm._watcher = null;
          vm._inactive = null;
          vm._directInactive = false;
          vm._isMounted = false;
          vm._isDestroyed = false;
          vm._isBeingDestroyed = false;
        }

        function lifecycleMixin (Vue) {
          Vue.prototype._update = function (vnode, hydrating) {
            var vm = this;
            var prevEl = vm.$el;
            var prevVnode = vm._vnode;
            var restoreActiveInstance = setActiveInstance(vm);
            vm._vnode = vnode;
            // Vue.prototype.__patch__ is injected in entry points
            // based on the rendering backend used.
            if (!prevVnode) {
              // initial render
              vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
            } else {
              // updates
              vm.$el = vm.__patch__(prevVnode, vnode);
            }
            restoreActiveInstance();
            // update __vue__ reference
            if (prevEl) {
              prevEl.__vue__ = null;
            }
            if (vm.$el) {
              vm.$el.__vue__ = vm;
            }
            // if parent is an HOC, update its $el as well
            if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
              vm.$parent.$el = vm.$el;
            }
            // updated hook is called by the scheduler to ensure that children are
            // updated in a parent's updated hook.
          };

          Vue.prototype.$forceUpdate = function () {
            var vm = this;
            if (vm._watcher) {
              vm._watcher.update();
            }
          };

          Vue.prototype.$destroy = function () {
            var vm = this;
            if (vm._isBeingDestroyed) {
              return
            }
            callHook(vm, 'beforeDestroy');
            vm._isBeingDestroyed = true;
            // remove self from parent
            var parent = vm.$parent;
            if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
              remove(parent.$children, vm);
            }
            // teardown watchers
            if (vm._watcher) {
              vm._watcher.teardown();
            }
            var i = vm._watchers.length;
            while (i--) {
              vm._watchers[i].teardown();
            }
            // remove reference from data ob
            // frozen object may not have observer.
            if (vm._data.__ob__) {
              vm._data.__ob__.vmCount--;
            }
            // call the last hook...
            vm._isDestroyed = true;
            // invoke destroy hooks on current rendered tree
            vm.__patch__(vm._vnode, null);
            // fire destroyed hook
            callHook(vm, 'destroyed');
            // turn off all instance listeners.
            vm.$off();
            // remove __vue__ reference
            if (vm.$el) {
              vm.$el.__vue__ = null;
            }
            // release circular reference (#6759)
            if (vm.$vnode) {
              vm.$vnode.parent = null;
            }
          };
        }

        function mountComponent (
          vm,
          el,
          hydrating
        ) {
          vm.$el = el;
          if (!vm.$options.render) {
            vm.$options.render = createEmptyVNode;
            {
              /* istanbul ignore if */
              if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                vm.$options.el || el) {
                warn(
                  'You are using the runtime-only build of Vue where the template ' +
                  'compiler is not available. Either pre-compile the templates into ' +
                  'render functions, or use the compiler-included build.',
                  vm
                );
              } else {
                warn(
                  'Failed to mount component: template or render function not defined.',
                  vm
                );
              }
            }
          }
          callHook(vm, 'beforeMount');

          var updateComponent;
          /* istanbul ignore if */
          if (config.performance && mark) {
            updateComponent = function () {
              var name = vm._name;
              var id = vm._uid;
              var startTag = "vue-perf-start:" + id;
              var endTag = "vue-perf-end:" + id;

              mark(startTag);
              var vnode = vm._render();
              mark(endTag);
              measure(("vue " + name + " render"), startTag, endTag);

              mark(startTag);
              vm._update(vnode, hydrating);
              mark(endTag);
              measure(("vue " + name + " patch"), startTag, endTag);
            };
          } else {
            updateComponent = function () {
              vm._update(vm._render(), hydrating);
            };
          }

          // we set this to vm._watcher inside the watcher's constructor
          // since the watcher's initial patch may call $forceUpdate (e.g. inside child
          // component's mounted hook), which relies on vm._watcher being already defined
          new Watcher(vm, updateComponent, noop, {
            before: function before () {
              if (vm._isMounted && !vm._isDestroyed) {
                callHook(vm, 'beforeUpdate');
              }
            }
          }, true /* isRenderWatcher */);
          hydrating = false;

          // manually mounted instance, call mounted on self
          // mounted is called for render-created child components in its inserted hook
          if (vm.$vnode == null) {
            vm._isMounted = true;
            callHook(vm, 'mounted');
          }
          return vm
        }

        function updateChildComponent (
          vm,
          propsData,
          listeners,
          parentVnode,
          renderChildren
        ) {
          {
            isUpdatingChildComponent = true;
          }

          // determine whether component has slot children
          // we need to do this before overwriting $options._renderChildren.

          // check if there are dynamic scopedSlots (hand-written or compiled but with
          // dynamic slot names). Static scoped slots compiled from template has the
          // "$stable" marker.
          var newScopedSlots = parentVnode.data.scopedSlots;
          var oldScopedSlots = vm.$scopedSlots;
          var hasDynamicScopedSlot = !!(
            (newScopedSlots && !newScopedSlots.$stable) ||
            (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
            (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key) ||
            (!newScopedSlots && vm.$scopedSlots.$key)
          );

          // Any static slot children from the parent may have changed during parent's
          // update. Dynamic scoped slots may also have changed. In such cases, a forced
          // update is necessary to ensure correctness.
          var needsForceUpdate = !!(
            renderChildren ||               // has new static slots
            vm.$options._renderChildren ||  // has old static slots
            hasDynamicScopedSlot
          );

          vm.$options._parentVnode = parentVnode;
          vm.$vnode = parentVnode; // update vm's placeholder node without re-render

          if (vm._vnode) { // update child tree's parent
            vm._vnode.parent = parentVnode;
          }
          vm.$options._renderChildren = renderChildren;

          // update $attrs and $listeners hash
          // these are also reactive so they may trigger child update if the child
          // used them during render
          vm.$attrs = parentVnode.data.attrs || emptyObject;
          vm.$listeners = listeners || emptyObject;

          // update props
          if (propsData && vm.$options.props) {
            toggleObserving(false);
            var props = vm._props;
            var propKeys = vm.$options._propKeys || [];
            for (var i = 0; i < propKeys.length; i++) {
              var key = propKeys[i];
              var propOptions = vm.$options.props; // wtf flow?
              props[key] = validateProp(key, propOptions, propsData, vm);
            }
            toggleObserving(true);
            // keep a copy of raw propsData
            vm.$options.propsData = propsData;
          }

          // update listeners
          listeners = listeners || emptyObject;
          var oldListeners = vm.$options._parentListeners;
          vm.$options._parentListeners = listeners;
          updateComponentListeners(vm, listeners, oldListeners);

          // resolve slots + force update if has children
          if (needsForceUpdate) {
            vm.$slots = resolveSlots(renderChildren, parentVnode.context);
            vm.$forceUpdate();
          }

          {
            isUpdatingChildComponent = false;
          }
        }

        function isInInactiveTree (vm) {
          while (vm && (vm = vm.$parent)) {
            if (vm._inactive) { return true }
          }
          return false
        }

        function activateChildComponent (vm, direct) {
          if (direct) {
            vm._directInactive = false;
            if (isInInactiveTree(vm)) {
              return
            }
          } else if (vm._directInactive) {
            return
          }
          if (vm._inactive || vm._inactive === null) {
            vm._inactive = false;
            for (var i = 0; i < vm.$children.length; i++) {
              activateChildComponent(vm.$children[i]);
            }
            callHook(vm, 'activated');
          }
        }

        function deactivateChildComponent (vm, direct) {
          if (direct) {
            vm._directInactive = true;
            if (isInInactiveTree(vm)) {
              return
            }
          }
          if (!vm._inactive) {
            vm._inactive = true;
            for (var i = 0; i < vm.$children.length; i++) {
              deactivateChildComponent(vm.$children[i]);
            }
            callHook(vm, 'deactivated');
          }
        }

        function callHook (vm, hook) {
          // #7573 disable dep collection when invoking lifecycle hooks
          pushTarget();
          var handlers = vm.$options[hook];
          var info = hook + " hook";
          if (handlers) {
            for (var i = 0, j = handlers.length; i < j; i++) {
              invokeWithErrorHandling(handlers[i], vm, null, vm, info);
            }
          }
          if (vm._hasHookEvent) {
            vm.$emit('hook:' + hook);
          }
          popTarget();
        }

        /*  */

        var MAX_UPDATE_COUNT = 100;

        var queue = [];
        var activatedChildren = [];
        var has = {};
        var circular = {};
        var waiting = false;
        var flushing = false;
        var index = 0;

        /**
         * Reset the scheduler's state.
         */
        function resetSchedulerState () {
          index = queue.length = activatedChildren.length = 0;
          has = {};
          {
            circular = {};
          }
          waiting = flushing = false;
        }

        // Async edge case #6566 requires saving the timestamp when event listeners are
        // attached. However, calling performance.now() has a perf overhead especially
        // if the page has thousands of event listeners. Instead, we take a timestamp
        // every time the scheduler flushes and use that for all event listeners
        // attached during that flush.
        var currentFlushTimestamp = 0;

        // Async edge case fix requires storing an event listener's attach timestamp.
        var getNow = Date.now;

        // Determine what event timestamp the browser is using. Annoyingly, the
        // timestamp can either be hi-res (relative to page load) or low-res
        // (relative to UNIX epoch), so in order to compare time we have to use the
        // same timestamp type when saving the flush timestamp.
        // All IE versions use low-res event timestamps, and have problematic clock
        // implementations (#9632)
        if (inBrowser && !isIE) {
          var performance = window.performance;
          if (
            performance &&
            typeof performance.now === 'function' &&
            getNow() > document.createEvent('Event').timeStamp
          ) {
            // if the event timestamp, although evaluated AFTER the Date.now(), is
            // smaller than it, it means the event is using a hi-res timestamp,
            // and we need to use the hi-res version for event listener timestamps as
            // well.
            getNow = function () { return performance.now(); };
          }
        }

        /**
         * Flush both queues and run the watchers.
         */
        function flushSchedulerQueue () {
          currentFlushTimestamp = getNow();
          flushing = true;
          var watcher, id;

          // Sort queue before flush.
          // This ensures that:
          // 1. Components are updated from parent to child. (because parent is always
          //    created before the child)
          // 2. A component's user watchers are run before its render watcher (because
          //    user watchers are created before the render watcher)
          // 3. If a component is destroyed during a parent component's watcher run,
          //    its watchers can be skipped.
          queue.sort(function (a, b) { return a.id - b.id; });

          // do not cache length because more watchers might be pushed
          // as we run existing watchers
          for (index = 0; index < queue.length; index++) {
            watcher = queue[index];
            if (watcher.before) {
              watcher.before();
            }
            id = watcher.id;
            has[id] = null;
            watcher.run();
            // in dev build, check and stop circular updates.
            if (has[id] != null) {
              circular[id] = (circular[id] || 0) + 1;
              if (circular[id] > MAX_UPDATE_COUNT) {
                warn(
                  'You may have an infinite update loop ' + (
                    watcher.user
                      ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                      : "in a component render function."
                  ),
                  watcher.vm
                );
                break
              }
            }
          }

          // keep copies of post queues before resetting state
          var activatedQueue = activatedChildren.slice();
          var updatedQueue = queue.slice();

          resetSchedulerState();

          // call component updated and activated hooks
          callActivatedHooks(activatedQueue);
          callUpdatedHooks(updatedQueue);

          // devtool hook
          /* istanbul ignore if */
          if (devtools && config.devtools) {
            devtools.emit('flush');
          }
        }

        function callUpdatedHooks (queue) {
          var i = queue.length;
          while (i--) {
            var watcher = queue[i];
            var vm = watcher.vm;
            if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
              callHook(vm, 'updated');
            }
          }
        }

        /**
         * Queue a kept-alive component that was activated during patch.
         * The queue will be processed after the entire tree has been patched.
         */
        function queueActivatedComponent (vm) {
          // setting _inactive to false here so that a render function can
          // rely on checking whether it's in an inactive tree (e.g. router-view)
          vm._inactive = false;
          activatedChildren.push(vm);
        }

        function callActivatedHooks (queue) {
          for (var i = 0; i < queue.length; i++) {
            queue[i]._inactive = true;
            activateChildComponent(queue[i], true /* true */);
          }
        }

        /**
         * Push a watcher into the watcher queue.
         * Jobs with duplicate IDs will be skipped unless it's
         * pushed when the queue is being flushed.
         */
        function queueWatcher (watcher) {
          var id = watcher.id;
          if (has[id] == null) {
            has[id] = true;
            if (!flushing) {
              queue.push(watcher);
            } else {
              // if already flushing, splice the watcher based on its id
              // if already past its id, it will be run next immediately.
              var i = queue.length - 1;
              while (i > index && queue[i].id > watcher.id) {
                i--;
              }
              queue.splice(i + 1, 0, watcher);
            }
            // queue the flush
            if (!waiting) {
              waiting = true;

              if (!config.async) {
                flushSchedulerQueue();
                return
              }
              nextTick(flushSchedulerQueue);
            }
          }
        }

        /*  */



        var uid$2 = 0;

        /**
         * A watcher parses an expression, collects dependencies,
         * and fires callback when the expression value changes.
         * This is used for both the $watch() api and directives.
         */
        var Watcher = function Watcher (
          vm,
          expOrFn,
          cb,
          options,
          isRenderWatcher
        ) {
          this.vm = vm;
          if (isRenderWatcher) {
            vm._watcher = this;
          }
          vm._watchers.push(this);
          // options
          if (options) {
            this.deep = !!options.deep;
            this.user = !!options.user;
            this.lazy = !!options.lazy;
            this.sync = !!options.sync;
            this.before = options.before;
          } else {
            this.deep = this.user = this.lazy = this.sync = false;
          }
          this.cb = cb;
          this.id = ++uid$2; // uid for batching
          this.active = true;
          this.dirty = this.lazy; // for lazy watchers
          this.deps = [];
          this.newDeps = [];
          this.depIds = new _Set();
          this.newDepIds = new _Set();
          this.expression = expOrFn.toString();
          // parse expression for getter
          if (typeof expOrFn === 'function') {
            this.getter = expOrFn;
          } else {
            this.getter = parsePath(expOrFn);
            if (!this.getter) {
              this.getter = noop;
              warn(
                "Failed watching path: \"" + expOrFn + "\" " +
                'Watcher only accepts simple dot-delimited paths. ' +
                'For full control, use a function instead.',
                vm
              );
            }
          }
          this.value = this.lazy
            ? undefined
            : this.get();
        };

        /**
         * Evaluate the getter, and re-collect dependencies.
         */
        Watcher.prototype.get = function get () {
          pushTarget(this);
          var value;
          var vm = this.vm;
          try {
            value = this.getter.call(vm, vm);
          } catch (e) {
            if (this.user) {
              handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
            } else {
              throw e
            }
          } finally {
            // "touch" every property so they are all tracked as
            // dependencies for deep watching
            if (this.deep) {
              traverse(value);
            }
            popTarget();
            this.cleanupDeps();
          }
          return value
        };

        /**
         * Add a dependency to this directive.
         */
        Watcher.prototype.addDep = function addDep (dep) {
          var id = dep.id;
          if (!this.newDepIds.has(id)) {
            this.newDepIds.add(id);
            this.newDeps.push(dep);
            if (!this.depIds.has(id)) {
              dep.addSub(this);
            }
          }
        };

        /**
         * Clean up for dependency collection.
         */
        Watcher.prototype.cleanupDeps = function cleanupDeps () {
          var i = this.deps.length;
          while (i--) {
            var dep = this.deps[i];
            if (!this.newDepIds.has(dep.id)) {
              dep.removeSub(this);
            }
          }
          var tmp = this.depIds;
          this.depIds = this.newDepIds;
          this.newDepIds = tmp;
          this.newDepIds.clear();
          tmp = this.deps;
          this.deps = this.newDeps;
          this.newDeps = tmp;
          this.newDeps.length = 0;
        };

        /**
         * Subscriber interface.
         * Will be called when a dependency changes.
         */
        Watcher.prototype.update = function update () {
          /* istanbul ignore else */
          if (this.lazy) {
            this.dirty = true;
          } else if (this.sync) {
            this.run();
          } else {
            queueWatcher(this);
          }
        };

        /**
         * Scheduler job interface.
         * Will be called by the scheduler.
         */
        Watcher.prototype.run = function run () {
          if (this.active) {
            var value = this.get();
            if (
              value !== this.value ||
              // Deep watchers and watchers on Object/Arrays should fire even
              // when the value is the same, because the value may
              // have mutated.
              isObject(value) ||
              this.deep
            ) {
              // set new value
              var oldValue = this.value;
              this.value = value;
              if (this.user) {
                var info = "callback for watcher \"" + (this.expression) + "\"";
                invokeWithErrorHandling(this.cb, this.vm, [value, oldValue], this.vm, info);
              } else {
                this.cb.call(this.vm, value, oldValue);
              }
            }
          }
        };

        /**
         * Evaluate the value of the watcher.
         * This only gets called for lazy watchers.
         */
        Watcher.prototype.evaluate = function evaluate () {
          this.value = this.get();
          this.dirty = false;
        };

        /**
         * Depend on all deps collected by this watcher.
         */
        Watcher.prototype.depend = function depend () {
          var i = this.deps.length;
          while (i--) {
            this.deps[i].depend();
          }
        };

        /**
         * Remove self from all dependencies' subscriber list.
         */
        Watcher.prototype.teardown = function teardown () {
          if (this.active) {
            // remove self from vm's watcher list
            // this is a somewhat expensive operation so we skip it
            // if the vm is being destroyed.
            if (!this.vm._isBeingDestroyed) {
              remove(this.vm._watchers, this);
            }
            var i = this.deps.length;
            while (i--) {
              this.deps[i].removeSub(this);
            }
            this.active = false;
          }
        };

        /*  */

        var sharedPropertyDefinition = {
          enumerable: true,
          configurable: true,
          get: noop,
          set: noop
        };

        function proxy (target, sourceKey, key) {
          sharedPropertyDefinition.get = function proxyGetter () {
            return this[sourceKey][key]
          };
          sharedPropertyDefinition.set = function proxySetter (val) {
            this[sourceKey][key] = val;
          };
          Object.defineProperty(target, key, sharedPropertyDefinition);
        }

        function initState (vm) {
          vm._watchers = [];
          var opts = vm.$options;
          if (opts.props) { initProps(vm, opts.props); }
          if (opts.methods) { initMethods(vm, opts.methods); }
          if (opts.data) {
            initData(vm);
          } else {
            observe(vm._data = {}, true /* asRootData */);
          }
          if (opts.computed) { initComputed(vm, opts.computed); }
          if (opts.watch && opts.watch !== nativeWatch) {
            initWatch(vm, opts.watch);
          }
        }

        function initProps (vm, propsOptions) {
          var propsData = vm.$options.propsData || {};
          var props = vm._props = {};
          // cache prop keys so that future props updates can iterate using Array
          // instead of dynamic object key enumeration.
          var keys = vm.$options._propKeys = [];
          var isRoot = !vm.$parent;
          // root instance props should be converted
          if (!isRoot) {
            toggleObserving(false);
          }
          var loop = function (key) {
            keys.push(key);
            var value = validateProp(key, propsOptions, propsData, vm);
            /* istanbul ignore else */
            {
              var hyphenatedKey = hyphenate(key);
              if (isReservedAttribute(hyphenatedKey) ||
                config.isReservedAttr(hyphenatedKey)) {
                warn(
                  ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                  vm
                );
              }
              defineReactive$$1(props, key, value, function () {
                if (!isRoot && !isUpdatingChildComponent) {
                  warn(
                    "Avoid mutating a prop directly since the value will be " +
                    "overwritten whenever the parent component re-renders. " +
                    "Instead, use a data or computed property based on the prop's " +
                    "value. Prop being mutated: \"" + key + "\"",
                    vm
                  );
                }
              });
            }
            // static props are already proxied on the component's prototype
            // during Vue.extend(). We only need to proxy props defined at
            // instantiation here.
            if (!(key in vm)) {
              proxy(vm, "_props", key);
            }
          };

          for (var key in propsOptions) loop(key);
          toggleObserving(true);
        }

        function initData (vm) {
          var data = vm.$options.data;
          data = vm._data = typeof data === 'function'
            ? getData(data, vm)
            : data || {};
          if (!isPlainObject(data)) {
            data = {};
            warn(
              'data functions should return an object:\n' +
              'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
              vm
            );
          }
          // proxy data on instance
          var keys = Object.keys(data);
          var props = vm.$options.props;
          var methods = vm.$options.methods;
          var i = keys.length;
          while (i--) {
            var key = keys[i];
            {
              if (methods && hasOwn(methods, key)) {
                warn(
                  ("Method \"" + key + "\" has already been defined as a data property."),
                  vm
                );
              }
            }
            if (props && hasOwn(props, key)) {
              warn(
                "The data property \"" + key + "\" is already declared as a prop. " +
                "Use prop default value instead.",
                vm
              );
            } else if (!isReserved(key)) {
              proxy(vm, "_data", key);
            }
          }
          // observe data
          observe(data, true /* asRootData */);
        }

        function getData (data, vm) {
          // #7573 disable dep collection when invoking data getters
          pushTarget();
          try {
            return data.call(vm, vm)
          } catch (e) {
            handleError(e, vm, "data()");
            return {}
          } finally {
            popTarget();
          }
        }

        var computedWatcherOptions = { lazy: true };

        function initComputed (vm, computed) {
          // $flow-disable-line
          var watchers = vm._computedWatchers = Object.create(null);
          // computed properties are just getters during SSR
          var isSSR = isServerRendering();

          for (var key in computed) {
            var userDef = computed[key];
            var getter = typeof userDef === 'function' ? userDef : userDef.get;
            if (getter == null) {
              warn(
                ("Getter is missing for computed property \"" + key + "\"."),
                vm
              );
            }

            if (!isSSR) {
              // create internal watcher for the computed property.
              watchers[key] = new Watcher(
                vm,
                getter || noop,
                noop,
                computedWatcherOptions
              );
            }

            // component-defined computed properties are already defined on the
            // component prototype. We only need to define computed properties defined
            // at instantiation here.
            if (!(key in vm)) {
              defineComputed(vm, key, userDef);
            } else {
              if (key in vm.$data) {
                warn(("The computed property \"" + key + "\" is already defined in data."), vm);
              } else if (vm.$options.props && key in vm.$options.props) {
                warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
              } else if (vm.$options.methods && key in vm.$options.methods) {
                warn(("The computed property \"" + key + "\" is already defined as a method."), vm);
              }
            }
          }
        }

        function defineComputed (
          target,
          key,
          userDef
        ) {
          var shouldCache = !isServerRendering();
          if (typeof userDef === 'function') {
            sharedPropertyDefinition.get = shouldCache
              ? createComputedGetter(key)
              : createGetterInvoker(userDef);
            sharedPropertyDefinition.set = noop;
          } else {
            sharedPropertyDefinition.get = userDef.get
              ? shouldCache && userDef.cache !== false
                ? createComputedGetter(key)
                : createGetterInvoker(userDef.get)
              : noop;
            sharedPropertyDefinition.set = userDef.set || noop;
          }
          if (sharedPropertyDefinition.set === noop) {
            sharedPropertyDefinition.set = function () {
              warn(
                ("Computed property \"" + key + "\" was assigned to but it has no setter."),
                this
              );
            };
          }
          Object.defineProperty(target, key, sharedPropertyDefinition);
        }

        function createComputedGetter (key) {
          return function computedGetter () {
            var watcher = this._computedWatchers && this._computedWatchers[key];
            if (watcher) {
              if (watcher.dirty) {
                watcher.evaluate();
              }
              if (Dep.target) {
                watcher.depend();
              }
              return watcher.value
            }
          }
        }

        function createGetterInvoker (fn) {
          return function computedGetter () {
            return fn.call(this, this)
          }
        }

        function initMethods (vm, methods) {
          var props = vm.$options.props;
          for (var key in methods) {
            {
              if (typeof methods[key] !== 'function') {
                warn(
                  "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
                  "Did you reference the function correctly?",
                  vm
                );
              }
              if (props && hasOwn(props, key)) {
                warn(
                  ("Method \"" + key + "\" has already been defined as a prop."),
                  vm
                );
              }
              if ((key in vm) && isReserved(key)) {
                warn(
                  "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
                  "Avoid defining component methods that start with _ or $."
                );
              }
            }
            vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
          }
        }

        function initWatch (vm, watch) {
          for (var key in watch) {
            var handler = watch[key];
            if (Array.isArray(handler)) {
              for (var i = 0; i < handler.length; i++) {
                createWatcher(vm, key, handler[i]);
              }
            } else {
              createWatcher(vm, key, handler);
            }
          }
        }

        function createWatcher (
          vm,
          expOrFn,
          handler,
          options
        ) {
          if (isPlainObject(handler)) {
            options = handler;
            handler = handler.handler;
          }
          if (typeof handler === 'string') {
            handler = vm[handler];
          }
          return vm.$watch(expOrFn, handler, options)
        }

        function stateMixin (Vue) {
          // flow somehow has problems with directly declared definition object
          // when using Object.defineProperty, so we have to procedurally build up
          // the object here.
          var dataDef = {};
          dataDef.get = function () { return this._data };
          var propsDef = {};
          propsDef.get = function () { return this._props };
          {
            dataDef.set = function () {
              warn(
                'Avoid replacing instance root $data. ' +
                'Use nested data properties instead.',
                this
              );
            };
            propsDef.set = function () {
              warn("$props is readonly.", this);
            };
          }
          Object.defineProperty(Vue.prototype, '$data', dataDef);
          Object.defineProperty(Vue.prototype, '$props', propsDef);

          Vue.prototype.$set = set;
          Vue.prototype.$delete = del;

          Vue.prototype.$watch = function (
            expOrFn,
            cb,
            options
          ) {
            var vm = this;
            if (isPlainObject(cb)) {
              return createWatcher(vm, expOrFn, cb, options)
            }
            options = options || {};
            options.user = true;
            var watcher = new Watcher(vm, expOrFn, cb, options);
            if (options.immediate) {
              var info = "callback for immediate watcher \"" + (watcher.expression) + "\"";
              pushTarget();
              invokeWithErrorHandling(cb, vm, [watcher.value], vm, info);
              popTarget();
            }
            return function unwatchFn () {
              watcher.teardown();
            }
          };
        }

        /*  */

        var uid$3 = 0;

        function initMixin (Vue) {
          Vue.prototype._init = function (options) {
            var vm = this;
            // a uid
            vm._uid = uid$3++;

            var startTag, endTag;
            /* istanbul ignore if */
            if (config.performance && mark) {
              startTag = "vue-perf-start:" + (vm._uid);
              endTag = "vue-perf-end:" + (vm._uid);
              mark(startTag);
            }

            // a flag to avoid this being observed
            vm._isVue = true;
            // merge options
            if (options && options._isComponent) {
              // optimize internal component instantiation
              // since dynamic options merging is pretty slow, and none of the
              // internal component options needs special treatment.
              initInternalComponent(vm, options);
            } else {
              vm.$options = mergeOptions(
                resolveConstructorOptions(vm.constructor),
                options || {},
                vm
              );
            }
            /* istanbul ignore else */
            {
              initProxy(vm);
            }
            // expose real self
            vm._self = vm;
            initLifecycle(vm);
            initEvents(vm);
            initRender(vm);
            callHook(vm, 'beforeCreate');
            initInjections(vm); // resolve injections before data/props
            initState(vm);
            initProvide(vm); // resolve provide after data/props
            callHook(vm, 'created');

            /* istanbul ignore if */
            if (config.performance && mark) {
              vm._name = formatComponentName(vm, false);
              mark(endTag);
              measure(("vue " + (vm._name) + " init"), startTag, endTag);
            }

            if (vm.$options.el) {
              vm.$mount(vm.$options.el);
            }
          };
        }

        function initInternalComponent (vm, options) {
          var opts = vm.$options = Object.create(vm.constructor.options);
          // doing this because it's faster than dynamic enumeration.
          var parentVnode = options._parentVnode;
          opts.parent = options.parent;
          opts._parentVnode = parentVnode;

          var vnodeComponentOptions = parentVnode.componentOptions;
          opts.propsData = vnodeComponentOptions.propsData;
          opts._parentListeners = vnodeComponentOptions.listeners;
          opts._renderChildren = vnodeComponentOptions.children;
          opts._componentTag = vnodeComponentOptions.tag;

          if (options.render) {
            opts.render = options.render;
            opts.staticRenderFns = options.staticRenderFns;
          }
        }

        function resolveConstructorOptions (Ctor) {
          var options = Ctor.options;
          if (Ctor.super) {
            var superOptions = resolveConstructorOptions(Ctor.super);
            var cachedSuperOptions = Ctor.superOptions;
            if (superOptions !== cachedSuperOptions) {
              // super option changed,
              // need to resolve new options.
              Ctor.superOptions = superOptions;
              // check if there are any late-modified/attached options (#4976)
              var modifiedOptions = resolveModifiedOptions(Ctor);
              // update base extend options
              if (modifiedOptions) {
                extend(Ctor.extendOptions, modifiedOptions);
              }
              options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
              if (options.name) {
                options.components[options.name] = Ctor;
              }
            }
          }
          return options
        }

        function resolveModifiedOptions (Ctor) {
          var modified;
          var latest = Ctor.options;
          var sealed = Ctor.sealedOptions;
          for (var key in latest) {
            if (latest[key] !== sealed[key]) {
              if (!modified) { modified = {}; }
              modified[key] = latest[key];
            }
          }
          return modified
        }

        function Vue (options) {
          if (!(this instanceof Vue)
          ) {
            warn('Vue is a constructor and should be called with the `new` keyword');
          }
          this._init(options);
        }

        initMixin(Vue);
        stateMixin(Vue);
        eventsMixin(Vue);
        lifecycleMixin(Vue);
        renderMixin(Vue);

        /*  */

        function initUse (Vue) {
          Vue.use = function (plugin) {
            var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
            if (installedPlugins.indexOf(plugin) > -1) {
              return this
            }

            // additional parameters
            var args = toArray(arguments, 1);
            args.unshift(this);
            if (typeof plugin.install === 'function') {
              plugin.install.apply(plugin, args);
            } else if (typeof plugin === 'function') {
              plugin.apply(null, args);
            }
            installedPlugins.push(plugin);
            return this
          };
        }

        /*  */

        function initMixin$1 (Vue) {
          Vue.mixin = function (mixin) {
            this.options = mergeOptions(this.options, mixin);
            return this
          };
        }

        /*  */

        function initExtend (Vue) {
          /**
           * Each instance constructor, including Vue, has a unique
           * cid. This enables us to create wrapped "child
           * constructors" for prototypal inheritance and cache them.
           */
          Vue.cid = 0;
          var cid = 1;

          /**
           * Class inheritance
           */
          Vue.extend = function (extendOptions) {
            extendOptions = extendOptions || {};
            var Super = this;
            var SuperId = Super.cid;
            var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
            if (cachedCtors[SuperId]) {
              return cachedCtors[SuperId]
            }

            var name = extendOptions.name || Super.options.name;
            if (name) {
              validateComponentName(name);
            }

            var Sub = function VueComponent (options) {
              this._init(options);
            };
            Sub.prototype = Object.create(Super.prototype);
            Sub.prototype.constructor = Sub;
            Sub.cid = cid++;
            Sub.options = mergeOptions(
              Super.options,
              extendOptions
            );
            Sub['super'] = Super;

            // For props and computed properties, we define the proxy getters on
            // the Vue instances at extension time, on the extended prototype. This
            // avoids Object.defineProperty calls for each instance created.
            if (Sub.options.props) {
              initProps$1(Sub);
            }
            if (Sub.options.computed) {
              initComputed$1(Sub);
            }

            // allow further extension/mixin/plugin usage
            Sub.extend = Super.extend;
            Sub.mixin = Super.mixin;
            Sub.use = Super.use;

            // create asset registers, so extended classes
            // can have their private assets too.
            ASSET_TYPES.forEach(function (type) {
              Sub[type] = Super[type];
            });
            // enable recursive self-lookup
            if (name) {
              Sub.options.components[name] = Sub;
            }

            // keep a reference to the super options at extension time.
            // later at instantiation we can check if Super's options have
            // been updated.
            Sub.superOptions = Super.options;
            Sub.extendOptions = extendOptions;
            Sub.sealedOptions = extend({}, Sub.options);

            // cache constructor
            cachedCtors[SuperId] = Sub;
            return Sub
          };
        }

        function initProps$1 (Comp) {
          var props = Comp.options.props;
          for (var key in props) {
            proxy(Comp.prototype, "_props", key);
          }
        }

        function initComputed$1 (Comp) {
          var computed = Comp.options.computed;
          for (var key in computed) {
            defineComputed(Comp.prototype, key, computed[key]);
          }
        }

        /*  */

        function initAssetRegisters (Vue) {
          /**
           * Create asset registration methods.
           */
          ASSET_TYPES.forEach(function (type) {
            Vue[type] = function (
              id,
              definition
            ) {
              if (!definition) {
                return this.options[type + 's'][id]
              } else {
                /* istanbul ignore if */
                if (type === 'component') {
                  validateComponentName(id);
                }
                if (type === 'component' && isPlainObject(definition)) {
                  definition.name = definition.name || id;
                  definition = this.options._base.extend(definition);
                }
                if (type === 'directive' && typeof definition === 'function') {
                  definition = { bind: definition, update: definition };
                }
                this.options[type + 's'][id] = definition;
                return definition
              }
            };
          });
        }

        /*  */





        function getComponentName (opts) {
          return opts && (opts.Ctor.options.name || opts.tag)
        }

        function matches (pattern, name) {
          if (Array.isArray(pattern)) {
            return pattern.indexOf(name) > -1
          } else if (typeof pattern === 'string') {
            return pattern.split(',').indexOf(name) > -1
          } else if (isRegExp(pattern)) {
            return pattern.test(name)
          }
          /* istanbul ignore next */
          return false
        }

        function pruneCache (keepAliveInstance, filter) {
          var cache = keepAliveInstance.cache;
          var keys = keepAliveInstance.keys;
          var _vnode = keepAliveInstance._vnode;
          for (var key in cache) {
            var entry = cache[key];
            if (entry) {
              var name = entry.name;
              if (name && !filter(name)) {
                pruneCacheEntry(cache, key, keys, _vnode);
              }
            }
          }
        }

        function pruneCacheEntry (
          cache,
          key,
          keys,
          current
        ) {
          var entry = cache[key];
          if (entry && (!current || entry.tag !== current.tag)) {
            entry.componentInstance.$destroy();
          }
          cache[key] = null;
          remove(keys, key);
        }

        var patternTypes = [String, RegExp, Array];

        var KeepAlive = {
          name: 'keep-alive',
          abstract: true,

          props: {
            include: patternTypes,
            exclude: patternTypes,
            max: [String, Number]
          },

          methods: {
            cacheVNode: function cacheVNode () {
              var ref = this;
              var cache = ref.cache;
              var keys = ref.keys;
              var vnodeToCache = ref.vnodeToCache;
              var keyToCache = ref.keyToCache;
              if (vnodeToCache) {
                var tag = vnodeToCache.tag;
                var componentInstance = vnodeToCache.componentInstance;
                var componentOptions = vnodeToCache.componentOptions;
                cache[keyToCache] = {
                  name: getComponentName(componentOptions),
                  tag: tag,
                  componentInstance: componentInstance,
                };
                keys.push(keyToCache);
                // prune oldest entry
                if (this.max && keys.length > parseInt(this.max)) {
                  pruneCacheEntry(cache, keys[0], keys, this._vnode);
                }
                this.vnodeToCache = null;
              }
            }
          },

          created: function created () {
            this.cache = Object.create(null);
            this.keys = [];
          },

          destroyed: function destroyed () {
            for (var key in this.cache) {
              pruneCacheEntry(this.cache, key, this.keys);
            }
          },

          mounted: function mounted () {
            var this$1 = this;

            this.cacheVNode();
            this.$watch('include', function (val) {
              pruneCache(this$1, function (name) { return matches(val, name); });
            });
            this.$watch('exclude', function (val) {
              pruneCache(this$1, function (name) { return !matches(val, name); });
            });
          },

          updated: function updated () {
            this.cacheVNode();
          },

          render: function render () {
            var slot = this.$slots.default;
            var vnode = getFirstComponentChild(slot);
            var componentOptions = vnode && vnode.componentOptions;
            if (componentOptions) {
              // check pattern
              var name = getComponentName(componentOptions);
              var ref = this;
              var include = ref.include;
              var exclude = ref.exclude;
              if (
                // not included
                (include && (!name || !matches(include, name))) ||
                // excluded
                (exclude && name && matches(exclude, name))
              ) {
                return vnode
              }

              var ref$1 = this;
              var cache = ref$1.cache;
              var keys = ref$1.keys;
              var key = vnode.key == null
                // same constructor may get registered as different local components
                // so cid alone is not enough (#3269)
                ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
                : vnode.key;
              if (cache[key]) {
                vnode.componentInstance = cache[key].componentInstance;
                // make current key freshest
                remove(keys, key);
                keys.push(key);
              } else {
                // delay setting the cache until update
                this.vnodeToCache = vnode;
                this.keyToCache = key;
              }

              vnode.data.keepAlive = true;
            }
            return vnode || (slot && slot[0])
          }
        };

        var builtInComponents = {
          KeepAlive: KeepAlive
        };

        /*  */

        function initGlobalAPI (Vue) {
          // config
          var configDef = {};
          configDef.get = function () { return config; };
          {
            configDef.set = function () {
              warn(
                'Do not replace the Vue.config object, set individual fields instead.'
              );
            };
          }
          Object.defineProperty(Vue, 'config', configDef);

          // exposed util methods.
          // NOTE: these are not considered part of the public API - avoid relying on
          // them unless you are aware of the risk.
          Vue.util = {
            warn: warn,
            extend: extend,
            mergeOptions: mergeOptions,
            defineReactive: defineReactive$$1
          };

          Vue.set = set;
          Vue.delete = del;
          Vue.nextTick = nextTick;

          // 2.6 explicit observable API
          Vue.observable = function (obj) {
            observe(obj);
            return obj
          };

          Vue.options = Object.create(null);
          ASSET_TYPES.forEach(function (type) {
            Vue.options[type + 's'] = Object.create(null);
          });

          // this is used to identify the "base" constructor to extend all plain-object
          // components with in Weex's multi-instance scenarios.
          Vue.options._base = Vue;

          extend(Vue.options.components, builtInComponents);

          initUse(Vue);
          initMixin$1(Vue);
          initExtend(Vue);
          initAssetRegisters(Vue);
        }

        initGlobalAPI(Vue);

        Object.defineProperty(Vue.prototype, '$isServer', {
          get: isServerRendering
        });

        Object.defineProperty(Vue.prototype, '$ssrContext', {
          get: function get () {
            /* istanbul ignore next */
            return this.$vnode && this.$vnode.ssrContext
          }
        });

        // expose FunctionalRenderContext for ssr runtime helper installation
        Object.defineProperty(Vue, 'FunctionalRenderContext', {
          value: FunctionalRenderContext
        });

        Vue.version = '2.6.14';

        /*  */

        // these are reserved for web because they are directly compiled away
        // during template compilation
        var isReservedAttr = makeMap('style,class');

        // attributes that should be using props for binding
        var acceptValue = makeMap('input,textarea,option,select,progress');
        var mustUseProp = function (tag, type, attr) {
          return (
            (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
            (attr === 'selected' && tag === 'option') ||
            (attr === 'checked' && tag === 'input') ||
            (attr === 'muted' && tag === 'video')
          )
        };

        var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

        var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');

        var convertEnumeratedValue = function (key, value) {
          return isFalsyAttrValue(value) || value === 'false'
            ? 'false'
            // allow arbitrary string value for contenteditable
            : key === 'contenteditable' && isValidContentEditableValue(value)
              ? value
              : 'true'
        };

        var isBooleanAttr = makeMap(
          'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
          'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
          'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
          'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
          'required,reversed,scoped,seamless,selected,sortable,' +
          'truespeed,typemustmatch,visible'
        );

        var xlinkNS = 'http://www.w3.org/1999/xlink';

        var isXlink = function (name) {
          return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
        };

        var getXlinkProp = function (name) {
          return isXlink(name) ? name.slice(6, name.length) : ''
        };

        var isFalsyAttrValue = function (val) {
          return val == null || val === false
        };

        /*  */

        function genClassForVnode (vnode) {
          var data = vnode.data;
          var parentNode = vnode;
          var childNode = vnode;
          while (isDef(childNode.componentInstance)) {
            childNode = childNode.componentInstance._vnode;
            if (childNode && childNode.data) {
              data = mergeClassData(childNode.data, data);
            }
          }
          while (isDef(parentNode = parentNode.parent)) {
            if (parentNode && parentNode.data) {
              data = mergeClassData(data, parentNode.data);
            }
          }
          return renderClass(data.staticClass, data.class)
        }

        function mergeClassData (child, parent) {
          return {
            staticClass: concat(child.staticClass, parent.staticClass),
            class: isDef(child.class)
              ? [child.class, parent.class]
              : parent.class
          }
        }

        function renderClass (
          staticClass,
          dynamicClass
        ) {
          if (isDef(staticClass) || isDef(dynamicClass)) {
            return concat(staticClass, stringifyClass(dynamicClass))
          }
          /* istanbul ignore next */
          return ''
        }

        function concat (a, b) {
          return a ? b ? (a + ' ' + b) : a : (b || '')
        }

        function stringifyClass (value) {
          if (Array.isArray(value)) {
            return stringifyArray(value)
          }
          if (isObject(value)) {
            return stringifyObject(value)
          }
          if (typeof value === 'string') {
            return value
          }
          /* istanbul ignore next */
          return ''
        }

        function stringifyArray (value) {
          var res = '';
          var stringified;
          for (var i = 0, l = value.length; i < l; i++) {
            if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
              if (res) { res += ' '; }
              res += stringified;
            }
          }
          return res
        }

        function stringifyObject (value) {
          var res = '';
          for (var key in value) {
            if (value[key]) {
              if (res) { res += ' '; }
              res += key;
            }
          }
          return res
        }

        /*  */

        var namespaceMap = {
          svg: 'http://www.w3.org/2000/svg',
          math: 'http://www.w3.org/1998/Math/MathML'
        };

        var isHTMLTag = makeMap(
          'html,body,base,head,link,meta,style,title,' +
          'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
          'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
          'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
          's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
          'embed,object,param,source,canvas,script,noscript,del,ins,' +
          'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
          'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
          'output,progress,select,textarea,' +
          'details,dialog,menu,menuitem,summary,' +
          'content,element,shadow,template,blockquote,iframe,tfoot'
        );

        // this map is intentionally selective, only covering SVG elements that may
        // contain child elements.
        var isSVG = makeMap(
          'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
          'foreignobject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
          'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
          true
        );

        var isPreTag = function (tag) { return tag === 'pre'; };

        var isReservedTag = function (tag) {
          return isHTMLTag(tag) || isSVG(tag)
        };

        function getTagNamespace (tag) {
          if (isSVG(tag)) {
            return 'svg'
          }
          // basic support for MathML
          // note it doesn't support other MathML elements being component roots
          if (tag === 'math') {
            return 'math'
          }
        }

        var unknownElementCache = Object.create(null);
        function isUnknownElement (tag) {
          /* istanbul ignore if */
          if (!inBrowser) {
            return true
          }
          if (isReservedTag(tag)) {
            return false
          }
          tag = tag.toLowerCase();
          /* istanbul ignore if */
          if (unknownElementCache[tag] != null) {
            return unknownElementCache[tag]
          }
          var el = document.createElement(tag);
          if (tag.indexOf('-') > -1) {
            // http://stackoverflow.com/a/28210364/1070244
            return (unknownElementCache[tag] = (
              el.constructor === window.HTMLUnknownElement ||
              el.constructor === window.HTMLElement
            ))
          } else {
            return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
          }
        }

        var isTextInputType = makeMap('text,number,password,search,email,tel,url');

        /*  */

        /**
         * Query an element selector if it's not an element already.
         */
        function query (el) {
          if (typeof el === 'string') {
            var selected = document.querySelector(el);
            if (!selected) {
              warn(
                'Cannot find element: ' + el
              );
              return document.createElement('div')
            }
            return selected
          } else {
            return el
          }
        }

        /*  */

        function createElement$1 (tagName, vnode) {
          var elm = document.createElement(tagName);
          if (tagName !== 'select') {
            return elm
          }
          // false or null will remove the attribute but undefined will not
          if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
            elm.setAttribute('multiple', 'multiple');
          }
          return elm
        }

        function createElementNS (namespace, tagName) {
          return document.createElementNS(namespaceMap[namespace], tagName)
        }

        function createTextNode (text) {
          return document.createTextNode(text)
        }

        function createComment (text) {
          return document.createComment(text)
        }

        function insertBefore (parentNode, newNode, referenceNode) {
          parentNode.insertBefore(newNode, referenceNode);
        }

        function removeChild (node, child) {
          node.removeChild(child);
        }

        function appendChild (node, child) {
          node.appendChild(child);
        }

        function parentNode (node) {
          return node.parentNode
        }

        function nextSibling (node) {
          return node.nextSibling
        }

        function tagName (node) {
          return node.tagName
        }

        function setTextContent (node, text) {
          node.textContent = text;
        }

        function setStyleScope (node, scopeId) {
          node.setAttribute(scopeId, '');
        }

        var nodeOps = /*#__PURE__*/Object.freeze({
          createElement: createElement$1,
          createElementNS: createElementNS,
          createTextNode: createTextNode,
          createComment: createComment,
          insertBefore: insertBefore,
          removeChild: removeChild,
          appendChild: appendChild,
          parentNode: parentNode,
          nextSibling: nextSibling,
          tagName: tagName,
          setTextContent: setTextContent,
          setStyleScope: setStyleScope
        });

        /*  */

        var ref = {
          create: function create (_, vnode) {
            registerRef(vnode);
          },
          update: function update (oldVnode, vnode) {
            if (oldVnode.data.ref !== vnode.data.ref) {
              registerRef(oldVnode, true);
              registerRef(vnode);
            }
          },
          destroy: function destroy (vnode) {
            registerRef(vnode, true);
          }
        };

        function registerRef (vnode, isRemoval) {
          var key = vnode.data.ref;
          if (!isDef(key)) { return }

          var vm = vnode.context;
          var ref = vnode.componentInstance || vnode.elm;
          var refs = vm.$refs;
          if (isRemoval) {
            if (Array.isArray(refs[key])) {
              remove(refs[key], ref);
            } else if (refs[key] === ref) {
              refs[key] = undefined;
            }
          } else {
            if (vnode.data.refInFor) {
              if (!Array.isArray(refs[key])) {
                refs[key] = [ref];
              } else if (refs[key].indexOf(ref) < 0) {
                // $flow-disable-line
                refs[key].push(ref);
              }
            } else {
              refs[key] = ref;
            }
          }
        }

        /**
         * Virtual DOM patching algorithm based on Snabbdom by
         * Simon Friis Vindum (@paldepind)
         * Licensed under the MIT License
         * https://github.com/paldepind/snabbdom/blob/master/LICENSE
         *
         * modified by Evan You (@yyx990803)
         *
         * Not type-checking this because this file is perf-critical and the cost
         * of making flow understand it is not worth it.
         */

        var emptyNode = new VNode('', {}, []);

        var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

        function sameVnode (a, b) {
          return (
            a.key === b.key &&
            a.asyncFactory === b.asyncFactory && (
              (
                a.tag === b.tag &&
                a.isComment === b.isComment &&
                isDef(a.data) === isDef(b.data) &&
                sameInputType(a, b)
              ) || (
                isTrue(a.isAsyncPlaceholder) &&
                isUndef(b.asyncFactory.error)
              )
            )
          )
        }

        function sameInputType (a, b) {
          if (a.tag !== 'input') { return true }
          var i;
          var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
          var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
          return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
        }

        function createKeyToOldIdx (children, beginIdx, endIdx) {
          var i, key;
          var map = {};
          for (i = beginIdx; i <= endIdx; ++i) {
            key = children[i].key;
            if (isDef(key)) { map[key] = i; }
          }
          return map
        }

        function createPatchFunction (backend) {
          var i, j;
          var cbs = {};

          var modules = backend.modules;
          var nodeOps = backend.nodeOps;

          for (i = 0; i < hooks.length; ++i) {
            cbs[hooks[i]] = [];
            for (j = 0; j < modules.length; ++j) {
              if (isDef(modules[j][hooks[i]])) {
                cbs[hooks[i]].push(modules[j][hooks[i]]);
              }
            }
          }

          function emptyNodeAt (elm) {
            return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
          }

          function createRmCb (childElm, listeners) {
            function remove$$1 () {
              if (--remove$$1.listeners === 0) {
                removeNode(childElm);
              }
            }
            remove$$1.listeners = listeners;
            return remove$$1
          }

          function removeNode (el) {
            var parent = nodeOps.parentNode(el);
            // element may have already been removed due to v-html / v-text
            if (isDef(parent)) {
              nodeOps.removeChild(parent, el);
            }
          }

          function isUnknownElement$$1 (vnode, inVPre) {
            return (
              !inVPre &&
              !vnode.ns &&
              !(
                config.ignoredElements.length &&
                config.ignoredElements.some(function (ignore) {
                  return isRegExp(ignore)
                    ? ignore.test(vnode.tag)
                    : ignore === vnode.tag
                })
              ) &&
              config.isUnknownElement(vnode.tag)
            )
          }

          var creatingElmInVPre = 0;

          function createElm (
            vnode,
            insertedVnodeQueue,
            parentElm,
            refElm,
            nested,
            ownerArray,
            index
          ) {
            if (isDef(vnode.elm) && isDef(ownerArray)) {
              // This vnode was used in a previous render!
              // now it's used as a new node, overwriting its elm would cause
              // potential patch errors down the road when it's used as an insertion
              // reference node. Instead, we clone the node on-demand before creating
              // associated DOM element for it.
              vnode = ownerArray[index] = cloneVNode(vnode);
            }

            vnode.isRootInsert = !nested; // for transition enter check
            if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
              return
            }

            var data = vnode.data;
            var children = vnode.children;
            var tag = vnode.tag;
            if (isDef(tag)) {
              {
                if (data && data.pre) {
                  creatingElmInVPre++;
                }
                if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                  warn(
                    'Unknown custom element: <' + tag + '> - did you ' +
                    'register the component correctly? For recursive components, ' +
                    'make sure to provide the "name" option.',
                    vnode.context
                  );
                }
              }

              vnode.elm = vnode.ns
                ? nodeOps.createElementNS(vnode.ns, tag)
                : nodeOps.createElement(tag, vnode);
              setScope(vnode);

              /* istanbul ignore if */
              {
                createChildren(vnode, children, insertedVnodeQueue);
                if (isDef(data)) {
                  invokeCreateHooks(vnode, insertedVnodeQueue);
                }
                insert(parentElm, vnode.elm, refElm);
              }

              if (data && data.pre) {
                creatingElmInVPre--;
              }
            } else if (isTrue(vnode.isComment)) {
              vnode.elm = nodeOps.createComment(vnode.text);
              insert(parentElm, vnode.elm, refElm);
            } else {
              vnode.elm = nodeOps.createTextNode(vnode.text);
              insert(parentElm, vnode.elm, refElm);
            }
          }

          function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
            var i = vnode.data;
            if (isDef(i)) {
              var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
              if (isDef(i = i.hook) && isDef(i = i.init)) {
                i(vnode, false /* hydrating */);
              }
              // after calling the init hook, if the vnode is a child component
              // it should've created a child instance and mounted it. the child
              // component also has set the placeholder vnode's elm.
              // in that case we can just return the element and be done.
              if (isDef(vnode.componentInstance)) {
                initComponent(vnode, insertedVnodeQueue);
                insert(parentElm, vnode.elm, refElm);
                if (isTrue(isReactivated)) {
                  reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                }
                return true
              }
            }
          }

          function initComponent (vnode, insertedVnodeQueue) {
            if (isDef(vnode.data.pendingInsert)) {
              insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
              vnode.data.pendingInsert = null;
            }
            vnode.elm = vnode.componentInstance.$el;
            if (isPatchable(vnode)) {
              invokeCreateHooks(vnode, insertedVnodeQueue);
              setScope(vnode);
            } else {
              // empty component root.
              // skip all element-related modules except for ref (#3455)
              registerRef(vnode);
              // make sure to invoke the insert hook
              insertedVnodeQueue.push(vnode);
            }
          }

          function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
            var i;
            // hack for #4339: a reactivated component with inner transition
            // does not trigger because the inner node's created hooks are not called
            // again. It's not ideal to involve module-specific logic in here but
            // there doesn't seem to be a better way to do it.
            var innerNode = vnode;
            while (innerNode.componentInstance) {
              innerNode = innerNode.componentInstance._vnode;
              if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                for (i = 0; i < cbs.activate.length; ++i) {
                  cbs.activate[i](emptyNode, innerNode);
                }
                insertedVnodeQueue.push(innerNode);
                break
              }
            }
            // unlike a newly created component,
            // a reactivated keep-alive component doesn't insert itself
            insert(parentElm, vnode.elm, refElm);
          }

          function insert (parent, elm, ref$$1) {
            if (isDef(parent)) {
              if (isDef(ref$$1)) {
                if (nodeOps.parentNode(ref$$1) === parent) {
                  nodeOps.insertBefore(parent, elm, ref$$1);
                }
              } else {
                nodeOps.appendChild(parent, elm);
              }
            }
          }

          function createChildren (vnode, children, insertedVnodeQueue) {
            if (Array.isArray(children)) {
              {
                checkDuplicateKeys(children);
              }
              for (var i = 0; i < children.length; ++i) {
                createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
              }
            } else if (isPrimitive(vnode.text)) {
              nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
            }
          }

          function isPatchable (vnode) {
            while (vnode.componentInstance) {
              vnode = vnode.componentInstance._vnode;
            }
            return isDef(vnode.tag)
          }

          function invokeCreateHooks (vnode, insertedVnodeQueue) {
            for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
              cbs.create[i$1](emptyNode, vnode);
            }
            i = vnode.data.hook; // Reuse variable
            if (isDef(i)) {
              if (isDef(i.create)) { i.create(emptyNode, vnode); }
              if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
            }
          }

          // set scope id attribute for scoped CSS.
          // this is implemented as a special case to avoid the overhead
          // of going through the normal attribute patching process.
          function setScope (vnode) {
            var i;
            if (isDef(i = vnode.fnScopeId)) {
              nodeOps.setStyleScope(vnode.elm, i);
            } else {
              var ancestor = vnode;
              while (ancestor) {
                if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                  nodeOps.setStyleScope(vnode.elm, i);
                }
                ancestor = ancestor.parent;
              }
            }
            // for slot content they should also get the scopeId from the host instance.
            if (isDef(i = activeInstance) &&
              i !== vnode.context &&
              i !== vnode.fnContext &&
              isDef(i = i.$options._scopeId)
            ) {
              nodeOps.setStyleScope(vnode.elm, i);
            }
          }

          function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
            for (; startIdx <= endIdx; ++startIdx) {
              createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
            }
          }

          function invokeDestroyHook (vnode) {
            var i, j;
            var data = vnode.data;
            if (isDef(data)) {
              if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
              for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
            }
            if (isDef(i = vnode.children)) {
              for (j = 0; j < vnode.children.length; ++j) {
                invokeDestroyHook(vnode.children[j]);
              }
            }
          }

          function removeVnodes (vnodes, startIdx, endIdx) {
            for (; startIdx <= endIdx; ++startIdx) {
              var ch = vnodes[startIdx];
              if (isDef(ch)) {
                if (isDef(ch.tag)) {
                  removeAndInvokeRemoveHook(ch);
                  invokeDestroyHook(ch);
                } else { // Text node
                  removeNode(ch.elm);
                }
              }
            }
          }

          function removeAndInvokeRemoveHook (vnode, rm) {
            if (isDef(rm) || isDef(vnode.data)) {
              var i;
              var listeners = cbs.remove.length + 1;
              if (isDef(rm)) {
                // we have a recursively passed down rm callback
                // increase the listeners count
                rm.listeners += listeners;
              } else {
                // directly removing
                rm = createRmCb(vnode.elm, listeners);
              }
              // recursively invoke hooks on child component root node
              if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                removeAndInvokeRemoveHook(i, rm);
              }
              for (i = 0; i < cbs.remove.length; ++i) {
                cbs.remove[i](vnode, rm);
              }
              if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                i(vnode, rm);
              } else {
                rm();
              }
            } else {
              removeNode(vnode.elm);
            }
          }

          function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
            var oldStartIdx = 0;
            var newStartIdx = 0;
            var oldEndIdx = oldCh.length - 1;
            var oldStartVnode = oldCh[0];
            var oldEndVnode = oldCh[oldEndIdx];
            var newEndIdx = newCh.length - 1;
            var newStartVnode = newCh[0];
            var newEndVnode = newCh[newEndIdx];
            var oldKeyToIdx, idxInOld, vnodeToMove, refElm;

            // removeOnly is a special flag used only by <transition-group>
            // to ensure removed elements stay in correct relative positions
            // during leaving transitions
            var canMove = !removeOnly;

            {
              checkDuplicateKeys(newCh);
            }

            while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
              if (isUndef(oldStartVnode)) {
                oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
              } else if (isUndef(oldEndVnode)) {
                oldEndVnode = oldCh[--oldEndIdx];
              } else if (sameVnode(oldStartVnode, newStartVnode)) {
                patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                oldStartVnode = oldCh[++oldStartIdx];
                newStartVnode = newCh[++newStartIdx];
              } else if (sameVnode(oldEndVnode, newEndVnode)) {
                patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                oldEndVnode = oldCh[--oldEndIdx];
                newEndVnode = newCh[--newEndIdx];
              } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                oldStartVnode = oldCh[++oldStartIdx];
                newEndVnode = newCh[--newEndIdx];
              } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                oldEndVnode = oldCh[--oldEndIdx];
                newStartVnode = newCh[++newStartIdx];
              } else {
                if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
                idxInOld = isDef(newStartVnode.key)
                  ? oldKeyToIdx[newStartVnode.key]
                  : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                if (isUndef(idxInOld)) { // New element
                  createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                } else {
                  vnodeToMove = oldCh[idxInOld];
                  if (sameVnode(vnodeToMove, newStartVnode)) {
                    patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                    oldCh[idxInOld] = undefined;
                    canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                  } else {
                    // same key but different element. treat as new element
                    createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                  }
                }
                newStartVnode = newCh[++newStartIdx];
              }
            }
            if (oldStartIdx > oldEndIdx) {
              refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
              addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
            } else if (newStartIdx > newEndIdx) {
              removeVnodes(oldCh, oldStartIdx, oldEndIdx);
            }
          }

          function checkDuplicateKeys (children) {
            var seenKeys = {};
            for (var i = 0; i < children.length; i++) {
              var vnode = children[i];
              var key = vnode.key;
              if (isDef(key)) {
                if (seenKeys[key]) {
                  warn(
                    ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
                    vnode.context
                  );
                } else {
                  seenKeys[key] = true;
                }
              }
            }
          }

          function findIdxInOld (node, oldCh, start, end) {
            for (var i = start; i < end; i++) {
              var c = oldCh[i];
              if (isDef(c) && sameVnode(node, c)) { return i }
            }
          }

          function patchVnode (
            oldVnode,
            vnode,
            insertedVnodeQueue,
            ownerArray,
            index,
            removeOnly
          ) {
            if (oldVnode === vnode) {
              return
            }

            if (isDef(vnode.elm) && isDef(ownerArray)) {
              // clone reused vnode
              vnode = ownerArray[index] = cloneVNode(vnode);
            }

            var elm = vnode.elm = oldVnode.elm;

            if (isTrue(oldVnode.isAsyncPlaceholder)) {
              if (isDef(vnode.asyncFactory.resolved)) {
                hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
              } else {
                vnode.isAsyncPlaceholder = true;
              }
              return
            }

            // reuse element for static trees.
            // note we only do this if the vnode is cloned -
            // if the new node is not cloned it means the render functions have been
            // reset by the hot-reload-api and we need to do a proper re-render.
            if (isTrue(vnode.isStatic) &&
              isTrue(oldVnode.isStatic) &&
              vnode.key === oldVnode.key &&
              (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
            ) {
              vnode.componentInstance = oldVnode.componentInstance;
              return
            }

            var i;
            var data = vnode.data;
            if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
              i(oldVnode, vnode);
            }

            var oldCh = oldVnode.children;
            var ch = vnode.children;
            if (isDef(data) && isPatchable(vnode)) {
              for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
              if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
            }
            if (isUndef(vnode.text)) {
              if (isDef(oldCh) && isDef(ch)) {
                if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
              } else if (isDef(ch)) {
                {
                  checkDuplicateKeys(ch);
                }
                if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
                addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
              } else if (isDef(oldCh)) {
                removeVnodes(oldCh, 0, oldCh.length - 1);
              } else if (isDef(oldVnode.text)) {
                nodeOps.setTextContent(elm, '');
              }
            } else if (oldVnode.text !== vnode.text) {
              nodeOps.setTextContent(elm, vnode.text);
            }
            if (isDef(data)) {
              if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
            }
          }

          function invokeInsertHook (vnode, queue, initial) {
            // delay insert hooks for component root nodes, invoke them after the
            // element is really inserted
            if (isTrue(initial) && isDef(vnode.parent)) {
              vnode.parent.data.pendingInsert = queue;
            } else {
              for (var i = 0; i < queue.length; ++i) {
                queue[i].data.hook.insert(queue[i]);
              }
            }
          }

          var hydrationBailed = false;
          // list of modules that can skip create hook during hydration because they
          // are already rendered on the client or has no need for initialization
          // Note: style is excluded because it relies on initial clone for future
          // deep updates (#7063).
          var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');

          // Note: this is a browser-only function so we can assume elms are DOM nodes.
          function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
            var i;
            var tag = vnode.tag;
            var data = vnode.data;
            var children = vnode.children;
            inVPre = inVPre || (data && data.pre);
            vnode.elm = elm;

            if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
              vnode.isAsyncPlaceholder = true;
              return true
            }
            // assert node match
            {
              if (!assertNodeMatch(elm, vnode, inVPre)) {
                return false
              }
            }
            if (isDef(data)) {
              if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
              if (isDef(i = vnode.componentInstance)) {
                // child component. it should have hydrated its own tree.
                initComponent(vnode, insertedVnodeQueue);
                return true
              }
            }
            if (isDef(tag)) {
              if (isDef(children)) {
                // empty element, allow client to pick up and populate children
                if (!elm.hasChildNodes()) {
                  createChildren(vnode, children, insertedVnodeQueue);
                } else {
                  // v-html and domProps: innerHTML
                  if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                    if (i !== elm.innerHTML) {
                      /* istanbul ignore if */
                      if (typeof console !== 'undefined' &&
                        !hydrationBailed
                      ) {
                        hydrationBailed = true;
                        console.warn('Parent: ', elm);
                        console.warn('server innerHTML: ', i);
                        console.warn('client innerHTML: ', elm.innerHTML);
                      }
                      return false
                    }
                  } else {
                    // iterate and compare children lists
                    var childrenMatch = true;
                    var childNode = elm.firstChild;
                    for (var i$1 = 0; i$1 < children.length; i$1++) {
                      if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
                        childrenMatch = false;
                        break
                      }
                      childNode = childNode.nextSibling;
                    }
                    // if childNode is not null, it means the actual childNodes list is
                    // longer than the virtual children list.
                    if (!childrenMatch || childNode) {
                      /* istanbul ignore if */
                      if (typeof console !== 'undefined' &&
                        !hydrationBailed
                      ) {
                        hydrationBailed = true;
                        console.warn('Parent: ', elm);
                        console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                      }
                      return false
                    }
                  }
                }
              }
              if (isDef(data)) {
                var fullInvoke = false;
                for (var key in data) {
                  if (!isRenderedModule(key)) {
                    fullInvoke = true;
                    invokeCreateHooks(vnode, insertedVnodeQueue);
                    break
                  }
                }
                if (!fullInvoke && data['class']) {
                  // ensure collecting deps for deep class bindings for future updates
                  traverse(data['class']);
                }
              }
            } else if (elm.data !== vnode.text) {
              elm.data = vnode.text;
            }
            return true
          }

          function assertNodeMatch (node, vnode, inVPre) {
            if (isDef(vnode.tag)) {
              return vnode.tag.indexOf('vue-component') === 0 || (
                !isUnknownElement$$1(vnode, inVPre) &&
                vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
              )
            } else {
              return node.nodeType === (vnode.isComment ? 8 : 3)
            }
          }

          return function patch (oldVnode, vnode, hydrating, removeOnly) {
            if (isUndef(vnode)) {
              if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
              return
            }

            var isInitialPatch = false;
            var insertedVnodeQueue = [];

            if (isUndef(oldVnode)) {
              // empty mount (likely as component), create new root element
              isInitialPatch = true;
              createElm(vnode, insertedVnodeQueue);
            } else {
              var isRealElement = isDef(oldVnode.nodeType);
              if (!isRealElement && sameVnode(oldVnode, vnode)) {
                // patch existing root node
                patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
              } else {
                if (isRealElement) {
                  // mounting to a real element
                  // check if this is server-rendered content and if we can perform
                  // a successful hydration.
                  if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                    oldVnode.removeAttribute(SSR_ATTR);
                    hydrating = true;
                  }
                  if (isTrue(hydrating)) {
                    if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                      invokeInsertHook(vnode, insertedVnodeQueue, true);
                      return oldVnode
                    } else {
                      warn(
                        'The client-side rendered virtual DOM tree is not matching ' +
                        'server-rendered content. This is likely caused by incorrect ' +
                        'HTML markup, for example nesting block-level elements inside ' +
                        '<p>, or missing <tbody>. Bailing hydration and performing ' +
                        'full client-side render.'
                      );
                    }
                  }
                  // either not server-rendered, or hydration failed.
                  // create an empty node and replace it
                  oldVnode = emptyNodeAt(oldVnode);
                }

                // replacing existing element
                var oldElm = oldVnode.elm;
                var parentElm = nodeOps.parentNode(oldElm);

                // create new node
                createElm(
                  vnode,
                  insertedVnodeQueue,
                  // extremely rare edge case: do not insert if old element is in a
                  // leaving transition. Only happens when combining transition +
                  // keep-alive + HOCs. (#4590)
                  oldElm._leaveCb ? null : parentElm,
                  nodeOps.nextSibling(oldElm)
                );

                // update parent placeholder node element, recursively
                if (isDef(vnode.parent)) {
                  var ancestor = vnode.parent;
                  var patchable = isPatchable(vnode);
                  while (ancestor) {
                    for (var i = 0; i < cbs.destroy.length; ++i) {
                      cbs.destroy[i](ancestor);
                    }
                    ancestor.elm = vnode.elm;
                    if (patchable) {
                      for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                        cbs.create[i$1](emptyNode, ancestor);
                      }
                      // #6513
                      // invoke insert hooks that may have been merged by create hooks.
                      // e.g. for directives that uses the "inserted" hook.
                      var insert = ancestor.data.hook.insert;
                      if (insert.merged) {
                        // start at index 1 to avoid re-invoking component mounted hook
                        for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                          insert.fns[i$2]();
                        }
                      }
                    } else {
                      registerRef(ancestor);
                    }
                    ancestor = ancestor.parent;
                  }
                }

                // destroy old node
                if (isDef(parentElm)) {
                  removeVnodes([oldVnode], 0, 0);
                } else if (isDef(oldVnode.tag)) {
                  invokeDestroyHook(oldVnode);
                }
              }
            }

            invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
            return vnode.elm
          }
        }

        /*  */

        var directives = {
          create: updateDirectives,
          update: updateDirectives,
          destroy: function unbindDirectives (vnode) {
            updateDirectives(vnode, emptyNode);
          }
        };

        function updateDirectives (oldVnode, vnode) {
          if (oldVnode.data.directives || vnode.data.directives) {
            _update(oldVnode, vnode);
          }
        }

        function _update (oldVnode, vnode) {
          var isCreate = oldVnode === emptyNode;
          var isDestroy = vnode === emptyNode;
          var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
          var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

          var dirsWithInsert = [];
          var dirsWithPostpatch = [];

          var key, oldDir, dir;
          for (key in newDirs) {
            oldDir = oldDirs[key];
            dir = newDirs[key];
            if (!oldDir) {
              // new directive, bind
              callHook$1(dir, 'bind', vnode, oldVnode);
              if (dir.def && dir.def.inserted) {
                dirsWithInsert.push(dir);
              }
            } else {
              // existing directive, update
              dir.oldValue = oldDir.value;
              dir.oldArg = oldDir.arg;
              callHook$1(dir, 'update', vnode, oldVnode);
              if (dir.def && dir.def.componentUpdated) {
                dirsWithPostpatch.push(dir);
              }
            }
          }

          if (dirsWithInsert.length) {
            var callInsert = function () {
              for (var i = 0; i < dirsWithInsert.length; i++) {
                callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
              }
            };
            if (isCreate) {
              mergeVNodeHook(vnode, 'insert', callInsert);
            } else {
              callInsert();
            }
          }

          if (dirsWithPostpatch.length) {
            mergeVNodeHook(vnode, 'postpatch', function () {
              for (var i = 0; i < dirsWithPostpatch.length; i++) {
                callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
              }
            });
          }

          if (!isCreate) {
            for (key in oldDirs) {
              if (!newDirs[key]) {
                // no longer present, unbind
                callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
              }
            }
          }
        }

        var emptyModifiers = Object.create(null);

        function normalizeDirectives$1 (
          dirs,
          vm
        ) {
          var res = Object.create(null);
          if (!dirs) {
            // $flow-disable-line
            return res
          }
          var i, dir;
          for (i = 0; i < dirs.length; i++) {
            dir = dirs[i];
            if (!dir.modifiers) {
              // $flow-disable-line
              dir.modifiers = emptyModifiers;
            }
            res[getRawDirName(dir)] = dir;
            dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
          }
          // $flow-disable-line
          return res
        }

        function getRawDirName (dir) {
          return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
        }

        function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
          var fn = dir.def && dir.def[hook];
          if (fn) {
            try {
              fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
            } catch (e) {
              handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
            }
          }
        }

        var baseModules = [
          ref,
          directives
        ];

        /*  */

        function updateAttrs (oldVnode, vnode) {
          var opts = vnode.componentOptions;
          if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
            return
          }
          if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
            return
          }
          var key, cur, old;
          var elm = vnode.elm;
          var oldAttrs = oldVnode.data.attrs || {};
          var attrs = vnode.data.attrs || {};
          // clone observed objects, as the user probably wants to mutate it
          if (isDef(attrs.__ob__)) {
            attrs = vnode.data.attrs = extend({}, attrs);
          }

          for (key in attrs) {
            cur = attrs[key];
            old = oldAttrs[key];
            if (old !== cur) {
              setAttr(elm, key, cur, vnode.data.pre);
            }
          }
          // #4391: in IE9, setting type can reset value for input[type=radio]
          // #6666: IE/Edge forces progress value down to 1 before setting a max
          /* istanbul ignore if */
          if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
            setAttr(elm, 'value', attrs.value);
          }
          for (key in oldAttrs) {
            if (isUndef(attrs[key])) {
              if (isXlink(key)) {
                elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
              } else if (!isEnumeratedAttr(key)) {
                elm.removeAttribute(key);
              }
            }
          }
        }

        function setAttr (el, key, value, isInPre) {
          if (isInPre || el.tagName.indexOf('-') > -1) {
            baseSetAttr(el, key, value);
          } else if (isBooleanAttr(key)) {
            // set attribute for blank value
            // e.g. <option disabled>Select one</option>
            if (isFalsyAttrValue(value)) {
              el.removeAttribute(key);
            } else {
              // technically allowfullscreen is a boolean attribute for <iframe>,
              // but Flash expects a value of "true" when used on <embed> tag
              value = key === 'allowfullscreen' && el.tagName === 'EMBED'
                ? 'true'
                : key;
              el.setAttribute(key, value);
            }
          } else if (isEnumeratedAttr(key)) {
            el.setAttribute(key, convertEnumeratedValue(key, value));
          } else if (isXlink(key)) {
            if (isFalsyAttrValue(value)) {
              el.removeAttributeNS(xlinkNS, getXlinkProp(key));
            } else {
              el.setAttributeNS(xlinkNS, key, value);
            }
          } else {
            baseSetAttr(el, key, value);
          }
        }

        function baseSetAttr (el, key, value) {
          if (isFalsyAttrValue(value)) {
            el.removeAttribute(key);
          } else {
            // #7138: IE10 & 11 fires input event when setting placeholder on
            // <textarea>... block the first input event and remove the blocker
            // immediately.
            /* istanbul ignore if */
            if (
              isIE && !isIE9 &&
              el.tagName === 'TEXTAREA' &&
              key === 'placeholder' && value !== '' && !el.__ieph
            ) {
              var blocker = function (e) {
                e.stopImmediatePropagation();
                el.removeEventListener('input', blocker);
              };
              el.addEventListener('input', blocker);
              // $flow-disable-line
              el.__ieph = true; /* IE placeholder patched */
            }
            el.setAttribute(key, value);
          }
        }

        var attrs = {
          create: updateAttrs,
          update: updateAttrs
        };

        /*  */

        function updateClass (oldVnode, vnode) {
          var el = vnode.elm;
          var data = vnode.data;
          var oldData = oldVnode.data;
          if (
            isUndef(data.staticClass) &&
            isUndef(data.class) && (
              isUndef(oldData) || (
                isUndef(oldData.staticClass) &&
                isUndef(oldData.class)
              )
            )
          ) {
            return
          }

          var cls = genClassForVnode(vnode);

          // handle transition classes
          var transitionClass = el._transitionClasses;
          if (isDef(transitionClass)) {
            cls = concat(cls, stringifyClass(transitionClass));
          }

          // set the class
          if (cls !== el._prevClass) {
            el.setAttribute('class', cls);
            el._prevClass = cls;
          }
        }

        var klass = {
          create: updateClass,
          update: updateClass
        };

        /*  */

        var validDivisionCharRE = /[\w).+\-_$\]]/;

        function parseFilters (exp) {
          var inSingle = false;
          var inDouble = false;
          var inTemplateString = false;
          var inRegex = false;
          var curly = 0;
          var square = 0;
          var paren = 0;
          var lastFilterIndex = 0;
          var c, prev, i, expression, filters;

          for (i = 0; i < exp.length; i++) {
            prev = c;
            c = exp.charCodeAt(i);
            if (inSingle) {
              if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
            } else if (inDouble) {
              if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
            } else if (inTemplateString) {
              if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
            } else if (inRegex) {
              if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
            } else if (
              c === 0x7C && // pipe
              exp.charCodeAt(i + 1) !== 0x7C &&
              exp.charCodeAt(i - 1) !== 0x7C &&
              !curly && !square && !paren
            ) {
              if (expression === undefined) {
                // first filter, end of expression
                lastFilterIndex = i + 1;
                expression = exp.slice(0, i).trim();
              } else {
                pushFilter();
              }
            } else {
              switch (c) {
                case 0x22: inDouble = true; break         // "
                case 0x27: inSingle = true; break         // '
                case 0x60: inTemplateString = true; break // `
                case 0x28: paren++; break                 // (
                case 0x29: paren--; break                 // )
                case 0x5B: square++; break                // [
                case 0x5D: square--; break                // ]
                case 0x7B: curly++; break                 // {
                case 0x7D: curly--; break                 // }
              }
              if (c === 0x2f) { // /
                var j = i - 1;
                var p = (void 0);
                // find first non-whitespace prev char
                for (; j >= 0; j--) {
                  p = exp.charAt(j);
                  if (p !== ' ') { break }
                }
                if (!p || !validDivisionCharRE.test(p)) {
                  inRegex = true;
                }
              }
            }
          }

          if (expression === undefined) {
            expression = exp.slice(0, i).trim();
          } else if (lastFilterIndex !== 0) {
            pushFilter();
          }

          function pushFilter () {
            (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
            lastFilterIndex = i + 1;
          }

          if (filters) {
            for (i = 0; i < filters.length; i++) {
              expression = wrapFilter(expression, filters[i]);
            }
          }

          return expression
        }

        function wrapFilter (exp, filter) {
          var i = filter.indexOf('(');
          if (i < 0) {
            // _f: resolveFilter
            return ("_f(\"" + filter + "\")(" + exp + ")")
          } else {
            var name = filter.slice(0, i);
            var args = filter.slice(i + 1);
            return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
          }
        }

        /*  */



        /* eslint-disable no-unused-vars */
        function baseWarn (msg, range) {
          console.error(("[Vue compiler]: " + msg));
        }
        /* eslint-enable no-unused-vars */

        function pluckModuleFunction (
          modules,
          key
        ) {
          return modules
            ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
            : []
        }

        function addProp (el, name, value, range, dynamic) {
          (el.props || (el.props = [])).push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
          el.plain = false;
        }

        function addAttr (el, name, value, range, dynamic) {
          var attrs = dynamic
            ? (el.dynamicAttrs || (el.dynamicAttrs = []))
            : (el.attrs || (el.attrs = []));
          attrs.push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
          el.plain = false;
        }

        // add a raw attr (use this in preTransforms)
        function addRawAttr (el, name, value, range) {
          el.attrsMap[name] = value;
          el.attrsList.push(rangeSetItem({ name: name, value: value }, range));
        }

        function addDirective (
          el,
          name,
          rawName,
          value,
          arg,
          isDynamicArg,
          modifiers,
          range
        ) {
          (el.directives || (el.directives = [])).push(rangeSetItem({
            name: name,
            rawName: rawName,
            value: value,
            arg: arg,
            isDynamicArg: isDynamicArg,
            modifiers: modifiers
          }, range));
          el.plain = false;
        }

        function prependModifierMarker (symbol, name, dynamic) {
          return dynamic
            ? ("_p(" + name + ",\"" + symbol + "\")")
            : symbol + name // mark the event as captured
        }

        function addHandler (
          el,
          name,
          value,
          modifiers,
          important,
          warn,
          range,
          dynamic
        ) {
          modifiers = modifiers || emptyObject;
          // warn prevent and passive modifier
          /* istanbul ignore if */
          if (
            warn &&
            modifiers.prevent && modifiers.passive
          ) {
            warn(
              'passive and prevent can\'t be used together. ' +
              'Passive handler can\'t prevent default event.',
              range
            );
          }

          // normalize click.right and click.middle since they don't actually fire
          // this is technically browser-specific, but at least for now browsers are
          // the only target envs that have right/middle clicks.
          if (modifiers.right) {
            if (dynamic) {
              name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
            } else if (name === 'click') {
              name = 'contextmenu';
              delete modifiers.right;
            }
          } else if (modifiers.middle) {
            if (dynamic) {
              name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
            } else if (name === 'click') {
              name = 'mouseup';
            }
          }

          // check capture modifier
          if (modifiers.capture) {
            delete modifiers.capture;
            name = prependModifierMarker('!', name, dynamic);
          }
          if (modifiers.once) {
            delete modifiers.once;
            name = prependModifierMarker('~', name, dynamic);
          }
          /* istanbul ignore if */
          if (modifiers.passive) {
            delete modifiers.passive;
            name = prependModifierMarker('&', name, dynamic);
          }

          var events;
          if (modifiers.native) {
            delete modifiers.native;
            events = el.nativeEvents || (el.nativeEvents = {});
          } else {
            events = el.events || (el.events = {});
          }

          var newHandler = rangeSetItem({ value: value.trim(), dynamic: dynamic }, range);
          if (modifiers !== emptyObject) {
            newHandler.modifiers = modifiers;
          }

          var handlers = events[name];
          /* istanbul ignore if */
          if (Array.isArray(handlers)) {
            important ? handlers.unshift(newHandler) : handlers.push(newHandler);
          } else if (handlers) {
            events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
          } else {
            events[name] = newHandler;
          }

          el.plain = false;
        }

        function getRawBindingAttr (
          el,
          name
        ) {
          return el.rawAttrsMap[':' + name] ||
            el.rawAttrsMap['v-bind:' + name] ||
            el.rawAttrsMap[name]
        }

        function getBindingAttr (
          el,
          name,
          getStatic
        ) {
          var dynamicValue =
            getAndRemoveAttr(el, ':' + name) ||
            getAndRemoveAttr(el, 'v-bind:' + name);
          if (dynamicValue != null) {
            return parseFilters(dynamicValue)
          } else if (getStatic !== false) {
            var staticValue = getAndRemoveAttr(el, name);
            if (staticValue != null) {
              return JSON.stringify(staticValue)
            }
          }
        }

        // note: this only removes the attr from the Array (attrsList) so that it
        // doesn't get processed by processAttrs.
        // By default it does NOT remove it from the map (attrsMap) because the map is
        // needed during codegen.
        function getAndRemoveAttr (
          el,
          name,
          removeFromMap
        ) {
          var val;
          if ((val = el.attrsMap[name]) != null) {
            var list = el.attrsList;
            for (var i = 0, l = list.length; i < l; i++) {
              if (list[i].name === name) {
                list.splice(i, 1);
                break
              }
            }
          }
          if (removeFromMap) {
            delete el.attrsMap[name];
          }
          return val
        }

        function getAndRemoveAttrByRegex (
          el,
          name
        ) {
          var list = el.attrsList;
          for (var i = 0, l = list.length; i < l; i++) {
            var attr = list[i];
            if (name.test(attr.name)) {
              list.splice(i, 1);
              return attr
            }
          }
        }

        function rangeSetItem (
          item,
          range
        ) {
          if (range) {
            if (range.start != null) {
              item.start = range.start;
            }
            if (range.end != null) {
              item.end = range.end;
            }
          }
          return item
        }

        /*  */

        /**
         * Cross-platform code generation for component v-model
         */
        function genComponentModel (
          el,
          value,
          modifiers
        ) {
          var ref = modifiers || {};
          var number = ref.number;
          var trim = ref.trim;

          var baseValueExpression = '$$v';
          var valueExpression = baseValueExpression;
          if (trim) {
            valueExpression =
              "(typeof " + baseValueExpression + " === 'string'" +
              "? " + baseValueExpression + ".trim()" +
              ": " + baseValueExpression + ")";
          }
          if (number) {
            valueExpression = "_n(" + valueExpression + ")";
          }
          var assignment = genAssignmentCode(value, valueExpression);

          el.model = {
            value: ("(" + value + ")"),
            expression: JSON.stringify(value),
            callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
          };
        }

        /**
         * Cross-platform codegen helper for generating v-model value assignment code.
         */
        function genAssignmentCode (
          value,
          assignment
        ) {
          var res = parseModel(value);
          if (res.key === null) {
            return (value + "=" + assignment)
          } else {
            return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
          }
        }

        /**
         * Parse a v-model expression into a base path and a final key segment.
         * Handles both dot-path and possible square brackets.
         *
         * Possible cases:
         *
         * - test
         * - test[key]
         * - test[test1[key]]
         * - test["a"][key]
         * - xxx.test[a[a].test1[key]]
         * - test.xxx.a["asa"][test1[key]]
         *
         */

        var len, str, chr, index$1, expressionPos, expressionEndPos;



        function parseModel (val) {
          // Fix https://github.com/vuejs/vue/pull/7730
          // allow v-model="obj.val " (trailing whitespace)
          val = val.trim();
          len = val.length;

          if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
            index$1 = val.lastIndexOf('.');
            if (index$1 > -1) {
              return {
                exp: val.slice(0, index$1),
                key: '"' + val.slice(index$1 + 1) + '"'
              }
            } else {
              return {
                exp: val,
                key: null
              }
            }
          }

          str = val;
          index$1 = expressionPos = expressionEndPos = 0;

          while (!eof()) {
            chr = next();
            /* istanbul ignore if */
            if (isStringStart(chr)) {
              parseString(chr);
            } else if (chr === 0x5B) {
              parseBracket(chr);
            }
          }

          return {
            exp: val.slice(0, expressionPos),
            key: val.slice(expressionPos + 1, expressionEndPos)
          }
        }

        function next () {
          return str.charCodeAt(++index$1)
        }

        function eof () {
          return index$1 >= len
        }

        function isStringStart (chr) {
          return chr === 0x22 || chr === 0x27
        }

        function parseBracket (chr) {
          var inBracket = 1;
          expressionPos = index$1;
          while (!eof()) {
            chr = next();
            if (isStringStart(chr)) {
              parseString(chr);
              continue
            }
            if (chr === 0x5B) { inBracket++; }
            if (chr === 0x5D) { inBracket--; }
            if (inBracket === 0) {
              expressionEndPos = index$1;
              break
            }
          }
        }

        function parseString (chr) {
          var stringQuote = chr;
          while (!eof()) {
            chr = next();
            if (chr === stringQuote) {
              break
            }
          }
        }

        /*  */

        var warn$1;

        // in some cases, the event used has to be determined at runtime
        // so we used some reserved tokens during compile.
        var RANGE_TOKEN = '__r';
        var CHECKBOX_RADIO_TOKEN = '__c';

        function model (
          el,
          dir,
          _warn
        ) {
          warn$1 = _warn;
          var value = dir.value;
          var modifiers = dir.modifiers;
          var tag = el.tag;
          var type = el.attrsMap.type;

          {
            // inputs with type="file" are read only and setting the input's
            // value will throw an error.
            if (tag === 'input' && type === 'file') {
              warn$1(
                "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                "File inputs are read only. Use a v-on:change listener instead.",
                el.rawAttrsMap['v-model']
              );
            }
          }

          if (el.component) {
            genComponentModel(el, value, modifiers);
            // component v-model doesn't need extra runtime
            return false
          } else if (tag === 'select') {
            genSelect(el, value, modifiers);
          } else if (tag === 'input' && type === 'checkbox') {
            genCheckboxModel(el, value, modifiers);
          } else if (tag === 'input' && type === 'radio') {
            genRadioModel(el, value, modifiers);
          } else if (tag === 'input' || tag === 'textarea') {
            genDefaultModel(el, value, modifiers);
          } else if (!config.isReservedTag(tag)) {
            genComponentModel(el, value, modifiers);
            // component v-model doesn't need extra runtime
            return false
          } else {
            warn$1(
              "<" + (el.tag) + " v-model=\"" + value + "\">: " +
              "v-model is not supported on this element type. " +
              'If you are working with contenteditable, it\'s recommended to ' +
              'wrap a library dedicated for that purpose inside a custom component.',
              el.rawAttrsMap['v-model']
            );
          }

          // ensure runtime directive metadata
          return true
        }

        function genCheckboxModel (
          el,
          value,
          modifiers
        ) {
          var number = modifiers && modifiers.number;
          var valueBinding = getBindingAttr(el, 'value') || 'null';
          var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
          var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
          addProp(el, 'checked',
            "Array.isArray(" + value + ")" +
            "?_i(" + value + "," + valueBinding + ")>-1" + (
              trueValueBinding === 'true'
                ? (":(" + value + ")")
                : (":_q(" + value + "," + trueValueBinding + ")")
            )
          );
          addHandler(el, 'change',
            "var $$a=" + value + "," +
            '$$el=$event.target,' +
            "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
            'if(Array.isArray($$a)){' +
            "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
            '$$i=_i($$a,$$v);' +
            "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
            "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
            "}else{" + (genAssignmentCode(value, '$$c')) + "}",
            null, true
          );
        }

        function genRadioModel (
          el,
          value,
          modifiers
        ) {
          var number = modifiers && modifiers.number;
          var valueBinding = getBindingAttr(el, 'value') || 'null';
          valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
          addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
          addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
        }

        function genSelect (
          el,
          value,
          modifiers
        ) {
          var number = modifiers && modifiers.number;
          var selectedVal = "Array.prototype.filter" +
            ".call($event.target.options,function(o){return o.selected})" +
            ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
            "return " + (number ? '_n(val)' : 'val') + "})";

          var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
          var code = "var $$selectedVal = " + selectedVal + ";";
          code = code + " " + (genAssignmentCode(value, assignment));
          addHandler(el, 'change', code, null, true);
        }

        function genDefaultModel (
          el,
          value,
          modifiers
        ) {
          var type = el.attrsMap.type;

          // warn if v-bind:value conflicts with v-model
          // except for inputs with v-bind:type
          {
            var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
            var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
            if (value$1 && !typeBinding) {
              var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
              warn$1(
                binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
                'because the latter already expands to a value binding internally',
                el.rawAttrsMap[binding]
              );
            }
          }

          var ref = modifiers || {};
          var lazy = ref.lazy;
          var number = ref.number;
          var trim = ref.trim;
          var needCompositionGuard = !lazy && type !== 'range';
          var event = lazy
            ? 'change'
            : type === 'range'
              ? RANGE_TOKEN
              : 'input';

          var valueExpression = '$event.target.value';
          if (trim) {
            valueExpression = "$event.target.value.trim()";
          }
          if (number) {
            valueExpression = "_n(" + valueExpression + ")";
          }

          var code = genAssignmentCode(value, valueExpression);
          if (needCompositionGuard) {
            code = "if($event.target.composing)return;" + code;
          }

          addProp(el, 'value', ("(" + value + ")"));
          addHandler(el, event, code, null, true);
          if (trim || number) {
            addHandler(el, 'blur', '$forceUpdate()');
          }
        }

        /*  */

        // normalize v-model event tokens that can only be determined at runtime.
        // it's important to place the event as the first in the array because
        // the whole point is ensuring the v-model callback gets called before
        // user-attached handlers.
        function normalizeEvents (on) {
          /* istanbul ignore if */
          if (isDef(on[RANGE_TOKEN])) {
            // IE input[type=range] only supports `change` event
            var event = isIE ? 'change' : 'input';
            on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
            delete on[RANGE_TOKEN];
          }
          // This was originally intended to fix #4521 but no longer necessary
          // after 2.5. Keeping it for backwards compat with generated code from < 2.4
          /* istanbul ignore if */
          if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
            on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
            delete on[CHECKBOX_RADIO_TOKEN];
          }
        }

        var target$1;

        function createOnceHandler$1 (event, handler, capture) {
          var _target = target$1; // save current target element in closure
          return function onceHandler () {
            var res = handler.apply(null, arguments);
            if (res !== null) {
              remove$2(event, onceHandler, capture, _target);
            }
          }
        }

        // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
        // implementation and does not fire microtasks in between event propagation, so
        // safe to exclude.
        var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);

        function add$1 (
          name,
          handler,
          capture,
          passive
        ) {
          // async edge case #6566: inner click event triggers patch, event handler
          // attached to outer element during patch, and triggered again. This
          // happens because browsers fire microtask ticks between event propagation.
          // the solution is simple: we save the timestamp when a handler is attached,
          // and the handler would only fire if the event passed to it was fired
          // AFTER it was attached.
          if (useMicrotaskFix) {
            var attachedTimestamp = currentFlushTimestamp;
            var original = handler;
            handler = original._wrapper = function (e) {
              if (
                // no bubbling, should always fire.
                // this is just a safety net in case event.timeStamp is unreliable in
                // certain weird environments...
                e.target === e.currentTarget ||
                // event is fired after handler attachment
                e.timeStamp >= attachedTimestamp ||
                // bail for environments that have buggy event.timeStamp implementations
                // #9462 iOS 9 bug: event.timeStamp is 0 after history.pushState
                // #9681 QtWebEngine event.timeStamp is negative value
                e.timeStamp <= 0 ||
                // #9448 bail if event is fired in another document in a multi-page
                // electron/nw.js app, since event.timeStamp will be using a different
                // starting reference
                e.target.ownerDocument !== document
              ) {
                return original.apply(this, arguments)
              }
            };
          }
          target$1.addEventListener(
            name,
            handler,
            supportsPassive
              ? { capture: capture, passive: passive }
              : capture
          );
        }

        function remove$2 (
          name,
          handler,
          capture,
          _target
        ) {
          (_target || target$1).removeEventListener(
            name,
            handler._wrapper || handler,
            capture
          );
        }

        function updateDOMListeners (oldVnode, vnode) {
          if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
            return
          }
          var on = vnode.data.on || {};
          var oldOn = oldVnode.data.on || {};
          target$1 = vnode.elm;
          normalizeEvents(on);
          updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
          target$1 = undefined;
        }

        var events = {
          create: updateDOMListeners,
          update: updateDOMListeners
        };

        /*  */

        var svgContainer;

        function updateDOMProps (oldVnode, vnode) {
          if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
            return
          }
          var key, cur;
          var elm = vnode.elm;
          var oldProps = oldVnode.data.domProps || {};
          var props = vnode.data.domProps || {};
          // clone observed objects, as the user probably wants to mutate it
          if (isDef(props.__ob__)) {
            props = vnode.data.domProps = extend({}, props);
          }

          for (key in oldProps) {
            if (!(key in props)) {
              elm[key] = '';
            }
          }

          for (key in props) {
            cur = props[key];
            // ignore children if the node has textContent or innerHTML,
            // as these will throw away existing DOM nodes and cause removal errors
            // on subsequent patches (#3360)
            if (key === 'textContent' || key === 'innerHTML') {
              if (vnode.children) { vnode.children.length = 0; }
              if (cur === oldProps[key]) { continue }
              // #6601 work around Chrome version <= 55 bug where single textNode
              // replaced by innerHTML/textContent retains its parentNode property
              if (elm.childNodes.length === 1) {
                elm.removeChild(elm.childNodes[0]);
              }
            }

            if (key === 'value' && elm.tagName !== 'PROGRESS') {
              // store value as _value as well since
              // non-string values will be stringified
              elm._value = cur;
              // avoid resetting cursor position when value is the same
              var strCur = isUndef(cur) ? '' : String(cur);
              if (shouldUpdateValue(elm, strCur)) {
                elm.value = strCur;
              }
            } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
              // IE doesn't support innerHTML for SVG elements
              svgContainer = svgContainer || document.createElement('div');
              svgContainer.innerHTML = "<svg>" + cur + "</svg>";
              var svg = svgContainer.firstChild;
              while (elm.firstChild) {
                elm.removeChild(elm.firstChild);
              }
              while (svg.firstChild) {
                elm.appendChild(svg.firstChild);
              }
            } else if (
              // skip the update if old and new VDOM state is the same.
              // `value` is handled separately because the DOM value may be temporarily
              // out of sync with VDOM state due to focus, composition and modifiers.
              // This  #4521 by skipping the unnecessary `checked` update.
              cur !== oldProps[key]
            ) {
              // some property updates can throw
              // e.g. `value` on <progress> w/ non-finite value
              try {
                elm[key] = cur;
              } catch (e) { }
            }
          }
        }

        // check platforms/web/util/attrs.js acceptValue


        function shouldUpdateValue (elm, checkVal) {
          return (!elm.composing && (
            elm.tagName === 'OPTION' ||
            isNotInFocusAndDirty(elm, checkVal) ||
            isDirtyWithModifiers(elm, checkVal)
          ))
        }

        function isNotInFocusAndDirty (elm, checkVal) {
          // return true when textbox (.number and .trim) loses focus and its value is
          // not equal to the updated value
          var notInFocus = true;
          // #6157
          // work around IE bug when accessing document.activeElement in an iframe
          try { notInFocus = document.activeElement !== elm; } catch (e) { }
          return notInFocus && elm.value !== checkVal
        }

        function isDirtyWithModifiers (elm, newVal) {
          var value = elm.value;
          var modifiers = elm._vModifiers; // injected by v-model runtime
          if (isDef(modifiers)) {
            if (modifiers.number) {
              return toNumber(value) !== toNumber(newVal)
            }
            if (modifiers.trim) {
              return value.trim() !== newVal.trim()
            }
          }
          return value !== newVal
        }

        var domProps = {
          create: updateDOMProps,
          update: updateDOMProps
        };

        /*  */

        var parseStyleText = cached(function (cssText) {
          var res = {};
          var listDelimiter = /;(?![^(]*\))/g;
          var propertyDelimiter = /:(.+)/;
          cssText.split(listDelimiter).forEach(function (item) {
            if (item) {
              var tmp = item.split(propertyDelimiter);
              tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
            }
          });
          return res
        });

        // merge static and dynamic style data on the same vnode
        function normalizeStyleData (data) {
          var style = normalizeStyleBinding(data.style);
          // static style is pre-processed into an object during compilation
          // and is always a fresh object, so it's safe to merge into it
          return data.staticStyle
            ? extend(data.staticStyle, style)
            : style
        }

        // normalize possible array / string values into Object
        function normalizeStyleBinding (bindingStyle) {
          if (Array.isArray(bindingStyle)) {
            return toObject(bindingStyle)
          }
          if (typeof bindingStyle === 'string') {
            return parseStyleText(bindingStyle)
          }
          return bindingStyle
        }

        /**
         * parent component style should be after child's
         * so that parent component's style could override it
         */
        function getStyle (vnode, checkChild) {
          var res = {};
          var styleData;

          if (checkChild) {
            var childNode = vnode;
            while (childNode.componentInstance) {
              childNode = childNode.componentInstance._vnode;
              if (
                childNode && childNode.data &&
                (styleData = normalizeStyleData(childNode.data))
              ) {
                extend(res, styleData);
              }
            }
          }

          if ((styleData = normalizeStyleData(vnode.data))) {
            extend(res, styleData);
          }

          var parentNode = vnode;
          while ((parentNode = parentNode.parent)) {
            if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
              extend(res, styleData);
            }
          }
          return res
        }

        /*  */

        var cssVarRE = /^--/;
        var importantRE = /\s*!important$/;
        var setProp = function (el, name, val) {
          /* istanbul ignore if */
          if (cssVarRE.test(name)) {
            el.style.setProperty(name, val);
          } else if (importantRE.test(val)) {
            el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
          } else {
            var normalizedName = normalize(name);
            if (Array.isArray(val)) {
              // Support values array created by autoprefixer, e.g.
              // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
              // Set them one by one, and the browser will only set those it can recognize
              for (var i = 0, len = val.length; i < len; i++) {
                el.style[normalizedName] = val[i];
              }
            } else {
              el.style[normalizedName] = val;
            }
          }
        };

        var vendorNames = ['Webkit', 'Moz', 'ms'];

        var emptyStyle;
        var normalize = cached(function (prop) {
          emptyStyle = emptyStyle || document.createElement('div').style;
          prop = camelize(prop);
          if (prop !== 'filter' && (prop in emptyStyle)) {
            return prop
          }
          var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
          for (var i = 0; i < vendorNames.length; i++) {
            var name = vendorNames[i] + capName;
            if (name in emptyStyle) {
              return name
            }
          }
        });

        function updateStyle (oldVnode, vnode) {
          var data = vnode.data;
          var oldData = oldVnode.data;

          if (isUndef(data.staticStyle) && isUndef(data.style) &&
            isUndef(oldData.staticStyle) && isUndef(oldData.style)
          ) {
            return
          }

          var cur, name;
          var el = vnode.elm;
          var oldStaticStyle = oldData.staticStyle;
          var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};

          // if static style exists, stylebinding already merged into it when doing normalizeStyleData
          var oldStyle = oldStaticStyle || oldStyleBinding;

          var style = normalizeStyleBinding(vnode.data.style) || {};

          // store normalized style under a different key for next diff
          // make sure to clone it if it's reactive, since the user likely wants
          // to mutate it.
          vnode.data.normalizedStyle = isDef(style.__ob__)
            ? extend({}, style)
            : style;

          var newStyle = getStyle(vnode, true);

          for (name in oldStyle) {
            if (isUndef(newStyle[name])) {
              setProp(el, name, '');
            }
          }
          for (name in newStyle) {
            cur = newStyle[name];
            if (cur !== oldStyle[name]) {
              // ie9 setting to null has no effect, must use empty string
              setProp(el, name, cur == null ? '' : cur);
            }
          }
        }

        var style = {
          create: updateStyle,
          update: updateStyle
        };

        /*  */

        var whitespaceRE = /\s+/;

        /**
         * Add class with compatibility for SVG since classList is not supported on
         * SVG elements in IE
         */
        function addClass (el, cls) {
          /* istanbul ignore if */
          if (!cls || !(cls = cls.trim())) {
            return
          }

          /* istanbul ignore else */
          if (el.classList) {
            if (cls.indexOf(' ') > -1) {
              cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });
            } else {
              el.classList.add(cls);
            }
          } else {
            var cur = " " + (el.getAttribute('class') || '') + " ";
            if (cur.indexOf(' ' + cls + ' ') < 0) {
              el.setAttribute('class', (cur + cls).trim());
            }
          }
        }

        /**
         * Remove class with compatibility for SVG since classList is not supported on
         * SVG elements in IE
         */
        function removeClass (el, cls) {
          /* istanbul ignore if */
          if (!cls || !(cls = cls.trim())) {
            return
          }

          /* istanbul ignore else */
          if (el.classList) {
            if (cls.indexOf(' ') > -1) {
              cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });
            } else {
              el.classList.remove(cls);
            }
            if (!el.classList.length) {
              el.removeAttribute('class');
            }
          } else {
            var cur = " " + (el.getAttribute('class') || '') + " ";
            var tar = ' ' + cls + ' ';
            while (cur.indexOf(tar) >= 0) {
              cur = cur.replace(tar, ' ');
            }
            cur = cur.trim();
            if (cur) {
              el.setAttribute('class', cur);
            } else {
              el.removeAttribute('class');
            }
          }
        }

        /*  */

        function resolveTransition (def$$1) {
          if (!def$$1) {
            return
          }
          /* istanbul ignore else */
          if (typeof def$$1 === 'object') {
            var res = {};
            if (def$$1.css !== false) {
              extend(res, autoCssTransition(def$$1.name || 'v'));
            }
            extend(res, def$$1);
            return res
          } else if (typeof def$$1 === 'string') {
            return autoCssTransition(def$$1)
          }
        }

        var autoCssTransition = cached(function (name) {
          return {
            enterClass: (name + "-enter"),
            enterToClass: (name + "-enter-to"),
            enterActiveClass: (name + "-enter-active"),
            leaveClass: (name + "-leave"),
            leaveToClass: (name + "-leave-to"),
            leaveActiveClass: (name + "-leave-active")
          }
        });

        var hasTransition = inBrowser && !isIE9;
        var TRANSITION = 'transition';
        var ANIMATION = 'animation';

        // Transition property/event sniffing
        var transitionProp = 'transition';
        var transitionEndEvent = 'transitionend';
        var animationProp = 'animation';
        var animationEndEvent = 'animationend';
        if (hasTransition) {
          /* istanbul ignore if */
          if (window.ontransitionend === undefined &&
            window.onwebkittransitionend !== undefined
          ) {
            transitionProp = 'WebkitTransition';
            transitionEndEvent = 'webkitTransitionEnd';
          }
          if (window.onanimationend === undefined &&
            window.onwebkitanimationend !== undefined
          ) {
            animationProp = 'WebkitAnimation';
            animationEndEvent = 'webkitAnimationEnd';
          }
        }

        // binding to window is necessary to make hot reload work in IE in strict mode
        var raf = inBrowser
          ? window.requestAnimationFrame
            ? window.requestAnimationFrame.bind(window)
            : setTimeout
          : /* istanbul ignore next */ function (fn) { return fn(); };

        function nextFrame (fn) {
          raf(function () {
            raf(fn);
          });
        }

        function addTransitionClass (el, cls) {
          var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
          if (transitionClasses.indexOf(cls) < 0) {
            transitionClasses.push(cls);
            addClass(el, cls);
          }
        }

        function removeTransitionClass (el, cls) {
          if (el._transitionClasses) {
            remove(el._transitionClasses, cls);
          }
          removeClass(el, cls);
        }

        function whenTransitionEnds (
          el,
          expectedType,
          cb
        ) {
          var ref = getTransitionInfo(el, expectedType);
          var type = ref.type;
          var timeout = ref.timeout;
          var propCount = ref.propCount;
          if (!type) { return cb() }
          var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
          var ended = 0;
          var end = function () {
            el.removeEventListener(event, onEnd);
            cb();
          };
          var onEnd = function (e) {
            if (e.target === el) {
              if (++ended >= propCount) {
                end();
              }
            }
          };
          setTimeout(function () {
            if (ended < propCount) {
              end();
            }
          }, timeout + 1);
          el.addEventListener(event, onEnd);
        }

        var transformRE = /\b(transform|all)(,|$)/;

        function getTransitionInfo (el, expectedType) {
          var styles = window.getComputedStyle(el);
          // JSDOM may return undefined for transition properties
          var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
          var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
          var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
          var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
          var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
          var animationTimeout = getTimeout(animationDelays, animationDurations);

          var type;
          var timeout = 0;
          var propCount = 0;
          /* istanbul ignore if */
          if (expectedType === TRANSITION) {
            if (transitionTimeout > 0) {
              type = TRANSITION;
              timeout = transitionTimeout;
              propCount = transitionDurations.length;
            }
          } else if (expectedType === ANIMATION) {
            if (animationTimeout > 0) {
              type = ANIMATION;
              timeout = animationTimeout;
              propCount = animationDurations.length;
            }
          } else {
            timeout = Math.max(transitionTimeout, animationTimeout);
            type = timeout > 0
              ? transitionTimeout > animationTimeout
                ? TRANSITION
                : ANIMATION
              : null;
            propCount = type
              ? type === TRANSITION
                ? transitionDurations.length
                : animationDurations.length
              : 0;
          }
          var hasTransform =
            type === TRANSITION &&
            transformRE.test(styles[transitionProp + 'Property']);
          return {
            type: type,
            timeout: timeout,
            propCount: propCount,
            hasTransform: hasTransform
          }
        }

        function getTimeout (delays, durations) {
          /* istanbul ignore next */
          while (delays.length < durations.length) {
            delays = delays.concat(delays);
          }

          return Math.max.apply(null, durations.map(function (d, i) {
            return toMs(d) + toMs(delays[i])
          }))
        }

        // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
        // in a locale-dependent way, using a comma instead of a dot.
        // If comma is not replaced with a dot, the input will be rounded down (i.e. acting
        // as a floor function) causing unexpected behaviors
        function toMs (s) {
          return Number(s.slice(0, -1).replace(',', '.')) * 1000
        }

        /*  */

        function enter (vnode, toggleDisplay) {
          var el = vnode.elm;

          // call leave callback now
          if (isDef(el._leaveCb)) {
            el._leaveCb.cancelled = true;
            el._leaveCb();
          }

          var data = resolveTransition(vnode.data.transition);
          if (isUndef(data)) {
            return
          }

          /* istanbul ignore if */
          if (isDef(el._enterCb) || el.nodeType !== 1) {
            return
          }

          var css = data.css;
          var type = data.type;
          var enterClass = data.enterClass;
          var enterToClass = data.enterToClass;
          var enterActiveClass = data.enterActiveClass;
          var appearClass = data.appearClass;
          var appearToClass = data.appearToClass;
          var appearActiveClass = data.appearActiveClass;
          var beforeEnter = data.beforeEnter;
          var enter = data.enter;
          var afterEnter = data.afterEnter;
          var enterCancelled = data.enterCancelled;
          var beforeAppear = data.beforeAppear;
          var appear = data.appear;
          var afterAppear = data.afterAppear;
          var appearCancelled = data.appearCancelled;
          var duration = data.duration;

          // activeInstance will always be the <transition> component managing this
          // transition. One edge case to check is when the <transition> is placed
          // as the root node of a child component. In that case we need to check
          // <transition>'s parent for appear check.
          var context = activeInstance;
          var transitionNode = activeInstance.$vnode;
          while (transitionNode && transitionNode.parent) {
            context = transitionNode.context;
            transitionNode = transitionNode.parent;
          }

          var isAppear = !context._isMounted || !vnode.isRootInsert;

          if (isAppear && !appear && appear !== '') {
            return
          }

          var startClass = isAppear && appearClass
            ? appearClass
            : enterClass;
          var activeClass = isAppear && appearActiveClass
            ? appearActiveClass
            : enterActiveClass;
          var toClass = isAppear && appearToClass
            ? appearToClass
            : enterToClass;

          var beforeEnterHook = isAppear
            ? (beforeAppear || beforeEnter)
            : beforeEnter;
          var enterHook = isAppear
            ? (typeof appear === 'function' ? appear : enter)
            : enter;
          var afterEnterHook = isAppear
            ? (afterAppear || afterEnter)
            : afterEnter;
          var enterCancelledHook = isAppear
            ? (appearCancelled || enterCancelled)
            : enterCancelled;

          var explicitEnterDuration = toNumber(
            isObject(duration)
              ? duration.enter
              : duration
          );

          if (explicitEnterDuration != null) {
            checkDuration(explicitEnterDuration, 'enter', vnode);
          }

          var expectsCSS = css !== false && !isIE9;
          var userWantsControl = getHookArgumentsLength(enterHook);

          var cb = el._enterCb = once(function () {
            if (expectsCSS) {
              removeTransitionClass(el, toClass);
              removeTransitionClass(el, activeClass);
            }
            if (cb.cancelled) {
              if (expectsCSS) {
                removeTransitionClass(el, startClass);
              }
              enterCancelledHook && enterCancelledHook(el);
            } else {
              afterEnterHook && afterEnterHook(el);
            }
            el._enterCb = null;
          });

          if (!vnode.data.show) {
            // remove pending leave element on enter by injecting an insert hook
            mergeVNodeHook(vnode, 'insert', function () {
              var parent = el.parentNode;
              var pendingNode = parent && parent._pending && parent._pending[vnode.key];
              if (pendingNode &&
                pendingNode.tag === vnode.tag &&
                pendingNode.elm._leaveCb
              ) {
                pendingNode.elm._leaveCb();
              }
              enterHook && enterHook(el, cb);
            });
          }

          // start enter transition
          beforeEnterHook && beforeEnterHook(el);
          if (expectsCSS) {
            addTransitionClass(el, startClass);
            addTransitionClass(el, activeClass);
            nextFrame(function () {
              removeTransitionClass(el, startClass);
              if (!cb.cancelled) {
                addTransitionClass(el, toClass);
                if (!userWantsControl) {
                  if (isValidDuration(explicitEnterDuration)) {
                    setTimeout(cb, explicitEnterDuration);
                  } else {
                    whenTransitionEnds(el, type, cb);
                  }
                }
              }
            });
          }

          if (vnode.data.show) {
            toggleDisplay && toggleDisplay();
            enterHook && enterHook(el, cb);
          }

          if (!expectsCSS && !userWantsControl) {
            cb();
          }
        }

        function leave (vnode, rm) {
          var el = vnode.elm;

          // call enter callback now
          if (isDef(el._enterCb)) {
            el._enterCb.cancelled = true;
            el._enterCb();
          }

          var data = resolveTransition(vnode.data.transition);
          if (isUndef(data) || el.nodeType !== 1) {
            return rm()
          }

          /* istanbul ignore if */
          if (isDef(el._leaveCb)) {
            return
          }

          var css = data.css;
          var type = data.type;
          var leaveClass = data.leaveClass;
          var leaveToClass = data.leaveToClass;
          var leaveActiveClass = data.leaveActiveClass;
          var beforeLeave = data.beforeLeave;
          var leave = data.leave;
          var afterLeave = data.afterLeave;
          var leaveCancelled = data.leaveCancelled;
          var delayLeave = data.delayLeave;
          var duration = data.duration;

          var expectsCSS = css !== false && !isIE9;
          var userWantsControl = getHookArgumentsLength(leave);

          var explicitLeaveDuration = toNumber(
            isObject(duration)
              ? duration.leave
              : duration
          );

          if (isDef(explicitLeaveDuration)) {
            checkDuration(explicitLeaveDuration, 'leave', vnode);
          }

          var cb = el._leaveCb = once(function () {
            if (el.parentNode && el.parentNode._pending) {
              el.parentNode._pending[vnode.key] = null;
            }
            if (expectsCSS) {
              removeTransitionClass(el, leaveToClass);
              removeTransitionClass(el, leaveActiveClass);
            }
            if (cb.cancelled) {
              if (expectsCSS) {
                removeTransitionClass(el, leaveClass);
              }
              leaveCancelled && leaveCancelled(el);
            } else {
              rm();
              afterLeave && afterLeave(el);
            }
            el._leaveCb = null;
          });

          if (delayLeave) {
            delayLeave(performLeave);
          } else {
            performLeave();
          }

          function performLeave () {
            // the delayed leave may have already been cancelled
            if (cb.cancelled) {
              return
            }
            // record leaving element
            if (!vnode.data.show && el.parentNode) {
              (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
            }
            beforeLeave && beforeLeave(el);
            if (expectsCSS) {
              addTransitionClass(el, leaveClass);
              addTransitionClass(el, leaveActiveClass);
              nextFrame(function () {
                removeTransitionClass(el, leaveClass);
                if (!cb.cancelled) {
                  addTransitionClass(el, leaveToClass);
                  if (!userWantsControl) {
                    if (isValidDuration(explicitLeaveDuration)) {
                      setTimeout(cb, explicitLeaveDuration);
                    } else {
                      whenTransitionEnds(el, type, cb);
                    }
                  }
                }
              });
            }
            leave && leave(el, cb);
            if (!expectsCSS && !userWantsControl) {
              cb();
            }
          }
        }

        // only used in dev mode
        function checkDuration (val, name, vnode) {
          if (typeof val !== 'number') {
            warn(
              "<transition> explicit " + name + " duration is not a valid number - " +
              "got " + (JSON.stringify(val)) + ".",
              vnode.context
            );
          } else if (isNaN(val)) {
            warn(
              "<transition> explicit " + name + " duration is NaN - " +
              'the duration expression might be incorrect.',
              vnode.context
            );
          }
        }

        function isValidDuration (val) {
          return typeof val === 'number' && !isNaN(val)
        }

        /**
         * Normalize a transition hook's argument length. The hook may be:
         * - a merged hook (invoker) with the original in .fns
         * - a wrapped component method (check ._length)
         * - a plain function (.length)
         */
        function getHookArgumentsLength (fn) {
          if (isUndef(fn)) {
            return false
          }
          var invokerFns = fn.fns;
          if (isDef(invokerFns)) {
            // invoker
            return getHookArgumentsLength(
              Array.isArray(invokerFns)
                ? invokerFns[0]
                : invokerFns
            )
          } else {
            return (fn._length || fn.length) > 1
          }
        }

        function _enter (_, vnode) {
          if (vnode.data.show !== true) {
            enter(vnode);
          }
        }

        var transition = inBrowser ? {
          create: _enter,
          activate: _enter,
          remove: function remove$$1 (vnode, rm) {
            /* istanbul ignore else */
            if (vnode.data.show !== true) {
              leave(vnode, rm);
            } else {
              rm();
            }
          }
        } : {};

        var platformModules = [
          attrs,
          klass,
          events,
          domProps,
          style,
          transition
        ];

        /*  */

        // the directive module should be applied last, after all
        // built-in modules have been applied.
        var modules = platformModules.concat(baseModules);

        var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });

        /**
         * Not type checking this file because flow doesn't like attaching
         * properties to Elements.
         */

        /* istanbul ignore if */
        if (isIE9) {
          // http://www.matts411.com/post/internet-explorer-9-oninput/
          document.addEventListener('selectionchange', function () {
            var el = document.activeElement;
            if (el && el.vmodel) {
              trigger(el, 'input');
            }
          });
        }

        var directive = {
          inserted: function inserted (el, binding, vnode, oldVnode) {
            if (vnode.tag === 'select') {
              // #6903
              if (oldVnode.elm && !oldVnode.elm._vOptions) {
                mergeVNodeHook(vnode, 'postpatch', function () {
                  directive.componentUpdated(el, binding, vnode);
                });
              } else {
                setSelected(el, binding, vnode.context);
              }
              el._vOptions = [].map.call(el.options, getValue);
            } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
              el._vModifiers = binding.modifiers;
              if (!binding.modifiers.lazy) {
                el.addEventListener('compositionstart', onCompositionStart);
                el.addEventListener('compositionend', onCompositionEnd);
                // Safari < 10.2 & UIWebView doesn't fire compositionend when
                // switching focus before confirming composition choice
                // this also fixes the issue where some browsers e.g. iOS Chrome
                // fires "change" instead of "input" on autocomplete.
                el.addEventListener('change', onCompositionEnd);
                /* istanbul ignore if */
                if (isIE9) {
                  el.vmodel = true;
                }
              }
            }
          },

          componentUpdated: function componentUpdated (el, binding, vnode) {
            if (vnode.tag === 'select') {
              setSelected(el, binding, vnode.context);
              // in case the options rendered by v-for have changed,
              // it's possible that the value is out-of-sync with the rendered options.
              // detect such cases and filter out values that no longer has a matching
              // option in the DOM.
              var prevOptions = el._vOptions;
              var curOptions = el._vOptions = [].map.call(el.options, getValue);
              if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
                // trigger change event if
                // no matching option found for at least one value
                var needReset = el.multiple
                  ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
                  : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                if (needReset) {
                  trigger(el, 'change');
                }
              }
            }
          }
        };

        function setSelected (el, binding, vm) {
          actuallySetSelected(el, binding, vm);
          /* istanbul ignore if */
          if (isIE || isEdge) {
            setTimeout(function () {
              actuallySetSelected(el, binding, vm);
            }, 0);
          }
        }

        function actuallySetSelected (el, binding, vm) {
          var value = binding.value;
          var isMultiple = el.multiple;
          if (isMultiple && !Array.isArray(value)) {
            warn(
              "<select multiple v-model=\"" + (binding.expression) + "\"> " +
              "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
              vm
            );
            return
          }
          var selected, option;
          for (var i = 0, l = el.options.length; i < l; i++) {
            option = el.options[i];
            if (isMultiple) {
              selected = looseIndexOf(value, getValue(option)) > -1;
              if (option.selected !== selected) {
                option.selected = selected;
              }
            } else {
              if (looseEqual(getValue(option), value)) {
                if (el.selectedIndex !== i) {
                  el.selectedIndex = i;
                }
                return
              }
            }
          }
          if (!isMultiple) {
            el.selectedIndex = -1;
          }
        }

        function hasNoMatchingOption (value, options) {
          return options.every(function (o) { return !looseEqual(o, value); })
        }

        function getValue (option) {
          return '_value' in option
            ? option._value
            : option.value
        }

        function onCompositionStart (e) {
          e.target.composing = true;
        }

        function onCompositionEnd (e) {
          // prevent triggering an input event for no reason
          if (!e.target.composing) { return }
          e.target.composing = false;
          trigger(e.target, 'input');
        }

        function trigger (el, type) {
          var e = document.createEvent('HTMLEvents');
          e.initEvent(type, true, true);
          el.dispatchEvent(e);
        }

        /*  */

        // recursively search for possible transition defined inside the component root
        function locateNode (vnode) {
          return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
            ? locateNode(vnode.componentInstance._vnode)
            : vnode
        }

        var show = {
          bind: function bind (el, ref, vnode) {
            var value = ref.value;

            vnode = locateNode(vnode);
            var transition$$1 = vnode.data && vnode.data.transition;
            var originalDisplay = el.__vOriginalDisplay =
              el.style.display === 'none' ? '' : el.style.display;
            if (value && transition$$1) {
              vnode.data.show = true;
              enter(vnode, function () {
                el.style.display = originalDisplay;
              });
            } else {
              el.style.display = value ? originalDisplay : 'none';
            }
          },

          update: function update (el, ref, vnode) {
            var value = ref.value;
            var oldValue = ref.oldValue;

            /* istanbul ignore if */
            if (!value === !oldValue) { return }
            vnode = locateNode(vnode);
            var transition$$1 = vnode.data && vnode.data.transition;
            if (transition$$1) {
              vnode.data.show = true;
              if (value) {
                enter(vnode, function () {
                  el.style.display = el.__vOriginalDisplay;
                });
              } else {
                leave(vnode, function () {
                  el.style.display = 'none';
                });
              }
            } else {
              el.style.display = value ? el.__vOriginalDisplay : 'none';
            }
          },

          unbind: function unbind (
            el,
            binding,
            vnode,
            oldVnode,
            isDestroy
          ) {
            if (!isDestroy) {
              el.style.display = el.__vOriginalDisplay;
            }
          }
        };

        var platformDirectives = {
          model: directive,
          show: show
        };

        /*  */

        var transitionProps = {
          name: String,
          appear: Boolean,
          css: Boolean,
          mode: String,
          type: String,
          enterClass: String,
          leaveClass: String,
          enterToClass: String,
          leaveToClass: String,
          enterActiveClass: String,
          leaveActiveClass: String,
          appearClass: String,
          appearActiveClass: String,
          appearToClass: String,
          duration: [Number, String, Object]
        };

        // in case the child is also an abstract component, e.g. <keep-alive>
        // we want to recursively retrieve the real component to be rendered
        function getRealChild (vnode) {
          var compOptions = vnode && vnode.componentOptions;
          if (compOptions && compOptions.Ctor.options.abstract) {
            return getRealChild(getFirstComponentChild(compOptions.children))
          } else {
            return vnode
          }
        }

        function extractTransitionData (comp) {
          var data = {};
          var options = comp.$options;
          // props
          for (var key in options.propsData) {
            data[key] = comp[key];
          }
          // events.
          // extract listeners and pass them directly to the transition methods
          var listeners = options._parentListeners;
          for (var key$1 in listeners) {
            data[camelize(key$1)] = listeners[key$1];
          }
          return data
        }

        function placeholder (h, rawChild) {
          if (/\d-keep-alive$/.test(rawChild.tag)) {
            return h('keep-alive', {
              props: rawChild.componentOptions.propsData
            })
          }
        }

        function hasParentTransition (vnode) {
          while ((vnode = vnode.parent)) {
            if (vnode.data.transition) {
              return true
            }
          }
        }

        function isSameChild (child, oldChild) {
          return oldChild.key === child.key && oldChild.tag === child.tag
        }

        var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };

        var isVShowDirective = function (d) { return d.name === 'show'; };

        var Transition = {
          name: 'transition',
          props: transitionProps,
          abstract: true,

          render: function render (h) {
            var this$1 = this;

            var children = this.$slots.default;
            if (!children) {
              return
            }

            // filter out text nodes (possible whitespaces)
            children = children.filter(isNotTextNode);
            /* istanbul ignore if */
            if (!children.length) {
              return
            }

            // warn multiple elements
            if (children.length > 1) {
              warn(
                '<transition> can only be used on a single element. Use ' +
                '<transition-group> for lists.',
                this.$parent
              );
            }

            var mode = this.mode;

            // warn invalid mode
            if (mode && mode !== 'in-out' && mode !== 'out-in'
            ) {
              warn(
                'invalid <transition> mode: ' + mode,
                this.$parent
              );
            }

            var rawChild = children[0];

            // if this is a component root node and the component's
            // parent container node also has transition, skip.
            if (hasParentTransition(this.$vnode)) {
              return rawChild
            }

            // apply transition data to child
            // use getRealChild() to ignore abstract components e.g. keep-alive
            var child = getRealChild(rawChild);
            /* istanbul ignore if */
            if (!child) {
              return rawChild
            }

            if (this._leaving) {
              return placeholder(h, rawChild)
            }

            // ensure a key that is unique to the vnode type and to this transition
            // component instance. This key will be used to remove pending leaving nodes
            // during entering.
            var id = "__transition-" + (this._uid) + "-";
            child.key = child.key == null
              ? child.isComment
                ? id + 'comment'
                : id + child.tag
              : isPrimitive(child.key)
                ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
                : child.key;

            var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
            var oldRawChild = this._vnode;
            var oldChild = getRealChild(oldRawChild);

            // mark v-show
            // so that the transition module can hand over the control to the directive
            if (child.data.directives && child.data.directives.some(isVShowDirective)) {
              child.data.show = true;
            }

            if (
              oldChild &&
              oldChild.data &&
              !isSameChild(child, oldChild) &&
              !isAsyncPlaceholder(oldChild) &&
              // #6687 component root is a comment node
              !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
            ) {
              // replace old child transition data with fresh one
              // important for dynamic transitions!
              var oldData = oldChild.data.transition = extend({}, data);
              // handle transition mode
              if (mode === 'out-in') {
                // return placeholder node and queue update when leave finishes
                this._leaving = true;
                mergeVNodeHook(oldData, 'afterLeave', function () {
                  this$1._leaving = false;
                  this$1.$forceUpdate();
                });
                return placeholder(h, rawChild)
              } else if (mode === 'in-out') {
                if (isAsyncPlaceholder(child)) {
                  return oldRawChild
                }
                var delayedLeave;
                var performLeave = function () { delayedLeave(); };
                mergeVNodeHook(data, 'afterEnter', performLeave);
                mergeVNodeHook(data, 'enterCancelled', performLeave);
                mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
              }
            }

            return rawChild
          }
        };

        /*  */

        var props = extend({
          tag: String,
          moveClass: String
        }, transitionProps);

        delete props.mode;

        var TransitionGroup = {
          props: props,

          beforeMount: function beforeMount () {
            var this$1 = this;

            var update = this._update;
            this._update = function (vnode, hydrating) {
              var restoreActiveInstance = setActiveInstance(this$1);
              // force removing pass
              this$1.__patch__(
                this$1._vnode,
                this$1.kept,
                false, // hydrating
                true // removeOnly (!important, avoids unnecessary moves)
              );
              this$1._vnode = this$1.kept;
              restoreActiveInstance();
              update.call(this$1, vnode, hydrating);
            };
          },

          render: function render (h) {
            var tag = this.tag || this.$vnode.data.tag || 'span';
            var map = Object.create(null);
            var prevChildren = this.prevChildren = this.children;
            var rawChildren = this.$slots.default || [];
            var children = this.children = [];
            var transitionData = extractTransitionData(this);

            for (var i = 0; i < rawChildren.length; i++) {
              var c = rawChildren[i];
              if (c.tag) {
                if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                  children.push(c);
                  map[c.key] = c
                    ; (c.data || (c.data = {})).transition = transitionData;
                } else {
                  var opts = c.componentOptions;
                  var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                  warn(("<transition-group> children must be keyed: <" + name + ">"));
                }
              }
            }

            if (prevChildren) {
              var kept = [];
              var removed = [];
              for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                var c$1 = prevChildren[i$1];
                c$1.data.transition = transitionData;
                c$1.data.pos = c$1.elm.getBoundingClientRect();
                if (map[c$1.key]) {
                  kept.push(c$1);
                } else {
                  removed.push(c$1);
                }
              }
              this.kept = h(tag, null, kept);
              this.removed = removed;
            }

            return h(tag, null, children)
          },

          updated: function updated () {
            var children = this.prevChildren;
            var moveClass = this.moveClass || ((this.name || 'v') + '-move');
            if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
              return
            }

            // we divide the work into three loops to avoid mixing DOM reads and writes
            // in each iteration - which helps prevent layout thrashing.
            children.forEach(callPendingCbs);
            children.forEach(recordPosition);
            children.forEach(applyTranslation);

            // force reflow to put everything in position
            // assign to this to avoid being removed in tree-shaking
            // $flow-disable-line
            this._reflow = document.body.offsetHeight;

            children.forEach(function (c) {
              if (c.data.moved) {
                var el = c.elm;
                var s = el.style;
                addTransitionClass(el, moveClass);
                s.transform = s.WebkitTransform = s.transitionDuration = '';
                el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
                  if (e && e.target !== el) {
                    return
                  }
                  if (!e || /transform$/.test(e.propertyName)) {
                    el.removeEventListener(transitionEndEvent, cb);
                    el._moveCb = null;
                    removeTransitionClass(el, moveClass);
                  }
                });
              }
            });
          },

          methods: {
            hasMove: function hasMove (el, moveClass) {
              /* istanbul ignore if */
              if (!hasTransition) {
                return false
              }
              /* istanbul ignore if */
              if (this._hasMove) {
                return this._hasMove
              }
              // Detect whether an element with the move class applied has
              // CSS transitions. Since the element may be inside an entering
              // transition at this very moment, we make a clone of it and remove
              // all other transition classes applied to ensure only the move class
              // is applied.
              var clone = el.cloneNode();
              if (el._transitionClasses) {
                el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
              }
              addClass(clone, moveClass);
              clone.style.display = 'none';
              this.$el.appendChild(clone);
              var info = getTransitionInfo(clone);
              this.$el.removeChild(clone);
              return (this._hasMove = info.hasTransform)
            }
          }
        };

        function callPendingCbs (c) {
          /* istanbul ignore if */
          if (c.elm._moveCb) {
            c.elm._moveCb();
          }
          /* istanbul ignore if */
          if (c.elm._enterCb) {
            c.elm._enterCb();
          }
        }

        function recordPosition (c) {
          c.data.newPos = c.elm.getBoundingClientRect();
        }

        function applyTranslation (c) {
          var oldPos = c.data.pos;
          var newPos = c.data.newPos;
          var dx = oldPos.left - newPos.left;
          var dy = oldPos.top - newPos.top;
          if (dx || dy) {
            c.data.moved = true;
            var s = c.elm.style;
            s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
            s.transitionDuration = '0s';
          }
        }

        var platformComponents = {
          Transition: Transition,
          TransitionGroup: TransitionGroup
        };

        /*  */

        // install platform specific utils
        Vue.config.mustUseProp = mustUseProp;
        Vue.config.isReservedTag = isReservedTag;
        Vue.config.isReservedAttr = isReservedAttr;
        Vue.config.getTagNamespace = getTagNamespace;
        Vue.config.isUnknownElement = isUnknownElement;

        // install platform runtime directives & components
        extend(Vue.options.directives, platformDirectives);
        extend(Vue.options.components, platformComponents);

        // install platform patch function
        Vue.prototype.__patch__ = inBrowser ? patch : noop;

        // public mount method
        Vue.prototype.$mount = function (
          el,
          hydrating
        ) {
          el = el && inBrowser ? query(el) : undefined;
          return mountComponent(this, el, hydrating)
        };

        // devtools global hook
        /* istanbul ignore next */
        if (inBrowser) {
          setTimeout(function () {
            if (config.devtools) {
              if (devtools) {
                devtools.emit('init', Vue);
              } else {
                console[console.info ? 'info' : 'log'](
                  'Download the Vue Devtools extension for a better development experience:\n' +
                  'https://github.com/vuejs/vue-devtools'
                );
              }
            }
            if (config.productionTip !== false &&
              typeof console !== 'undefined'
            ) {
              console[console.info ? 'info' : 'log'](
                "You are running Vue in development mode.\n" +
                "Make sure to turn on production mode when deploying for production.\n" +
                "See more tips at https://vuejs.org/guide/deployment.html"
              );
            }
          }, 0);
        }

        /*  */

        var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
        var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

        var buildRegex = cached(function (delimiters) {
          var open = delimiters[0].replace(regexEscapeRE, '\\$&');
          var close = delimiters[1].replace(regexEscapeRE, '\\$&');
          return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
        });



        function parseText (
          text,
          delimiters
        ) {
          var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
          if (!tagRE.test(text)) {
            return
          }
          var tokens = [];
          var rawTokens = [];
          var lastIndex = tagRE.lastIndex = 0;
          var match, index, tokenValue;
          while ((match = tagRE.exec(text))) {
            index = match.index;
            // push text token
            if (index > lastIndex) {
              rawTokens.push(tokenValue = text.slice(lastIndex, index));
              tokens.push(JSON.stringify(tokenValue));
            }
            // tag token
            var exp = parseFilters(match[1].trim());
            tokens.push(("_s(" + exp + ")"));
            rawTokens.push({ '@binding': exp });
            lastIndex = index + match[0].length;
          }
          if (lastIndex < text.length) {
            rawTokens.push(tokenValue = text.slice(lastIndex));
            tokens.push(JSON.stringify(tokenValue));
          }
          return {
            expression: tokens.join('+'),
            tokens: rawTokens
          }
        }

        /*  */

        function transformNode (el, options) {
          var warn = options.warn || baseWarn;
          var staticClass = getAndRemoveAttr(el, 'class');
          if (staticClass) {
            var res = parseText(staticClass, options.delimiters);
            if (res) {
              warn(
                "class=\"" + staticClass + "\": " +
                'Interpolation inside attributes has been removed. ' +
                'Use v-bind or the colon shorthand instead. For example, ' +
                'instead of <div class="{{ val }}">, use <div :class="val">.',
                el.rawAttrsMap['class']
              );
            }
          }
          if (staticClass) {
            el.staticClass = JSON.stringify(staticClass);
          }
          var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
          if (classBinding) {
            el.classBinding = classBinding;
          }
        }

        function genData (el) {
          var data = '';
          if (el.staticClass) {
            data += "staticClass:" + (el.staticClass) + ",";
          }
          if (el.classBinding) {
            data += "class:" + (el.classBinding) + ",";
          }
          return data
        }

        var klass$1 = {
          staticKeys: ['staticClass'],
          transformNode: transformNode,
          genData: genData
        };

        /*  */

        function transformNode$1 (el, options) {
          var warn = options.warn || baseWarn;
          var staticStyle = getAndRemoveAttr(el, 'style');
          if (staticStyle) {
            /* istanbul ignore if */
            {
              var res = parseText(staticStyle, options.delimiters);
              if (res) {
                warn(
                  "style=\"" + staticStyle + "\": " +
                  'Interpolation inside attributes has been removed. ' +
                  'Use v-bind or the colon shorthand instead. For example, ' +
                  'instead of <div style="{{ val }}">, use <div :style="val">.',
                  el.rawAttrsMap['style']
                );
              }
            }
            el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
          }

          var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
          if (styleBinding) {
            el.styleBinding = styleBinding;
          }
        }

        function genData$1 (el) {
          var data = '';
          if (el.staticStyle) {
            data += "staticStyle:" + (el.staticStyle) + ",";
          }
          if (el.styleBinding) {
            data += "style:(" + (el.styleBinding) + "),";
          }
          return data
        }

        var style$1 = {
          staticKeys: ['staticStyle'],
          transformNode: transformNode$1,
          genData: genData$1
        };

        /*  */

        var decoder;

        var he = {
          decode: function decode (html) {
            decoder = decoder || document.createElement('div');
            decoder.innerHTML = html;
            return decoder.textContent
          }
        };

        /*  */

        var isUnaryTag = makeMap(
          'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
          'link,meta,param,source,track,wbr'
        );

        // Elements that you can, intentionally, leave open
        // (and which close themselves)
        var canBeLeftOpenTag = makeMap(
          'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
        );

        // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
        // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
        var isNonPhrasingTag = makeMap(
          'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
          'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
          'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
          'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
          'title,tr,track'
        );

        /**
         * Not type-checking this file because it's mostly vendor code.
         */

        // Regular Expressions for parsing tags and attributes
        var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
        var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+?\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
        var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
        var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
        var startTagOpen = new RegExp(("^<" + qnameCapture));
        var startTagClose = /^\s*(\/?)>/;
        var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
        var doctype = /^<!DOCTYPE [^>]+>/i;
        // #7298: escape - to avoid being passed as HTML comment when inlined in page
        var comment = /^<!\--/;
        var conditionalComment = /^<!\[/;

        // Special Elements (can contain anything)
        var isPlainTextElement = makeMap('script,style,textarea', true);
        var reCache = {};

        var decodingMap = {
          '&lt;': '<',
          '&gt;': '>',
          '&quot;': '"',
          '&amp;': '&',
          '&#10;': '\n',
          '&#9;': '\t',
          '&#39;': "'"
        };
        var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
        var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;

        // #5992
        var isIgnoreNewlineTag = makeMap('pre,textarea', true);
        var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };

        function decodeAttr (value, shouldDecodeNewlines) {
          var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
          return value.replace(re, function (match) { return decodingMap[match]; })
        }

        function parseHTML (html, options) {
          var stack = [];
          var expectHTML = options.expectHTML;
          var isUnaryTag$$1 = options.isUnaryTag || no;
          var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
          var index = 0;
          var last, lastTag;
          while (html) {
            last = html;
            // Make sure we're not in a plaintext content element like script/style
            if (!lastTag || !isPlainTextElement(lastTag)) {
              var textEnd = html.indexOf('<');
              if (textEnd === 0) {
                // Comment:
                if (comment.test(html)) {
                  var commentEnd = html.indexOf('-->');

                  if (commentEnd >= 0) {
                    if (options.shouldKeepComment) {
                      options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
                    }
                    advance(commentEnd + 3);
                    continue
                  }
                }

                // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                if (conditionalComment.test(html)) {
                  var conditionalEnd = html.indexOf(']>');

                  if (conditionalEnd >= 0) {
                    advance(conditionalEnd + 2);
                    continue
                  }
                }

                // Doctype:
                var doctypeMatch = html.match(doctype);
                if (doctypeMatch) {
                  advance(doctypeMatch[0].length);
                  continue
                }

                // End tag:
                var endTagMatch = html.match(endTag);
                if (endTagMatch) {
                  var curIndex = index;
                  advance(endTagMatch[0].length);
                  parseEndTag(endTagMatch[1], curIndex, index);
                  continue
                }

                // Start tag:
                var startTagMatch = parseStartTag();
                if (startTagMatch) {
                  handleStartTag(startTagMatch);
                  if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
                    advance(1);
                  }
                  continue
                }
              }

              var text = (void 0), rest = (void 0), next = (void 0);
              if (textEnd >= 0) {
                rest = html.slice(textEnd);
                while (
                  !endTag.test(rest) &&
                  !startTagOpen.test(rest) &&
                  !comment.test(rest) &&
                  !conditionalComment.test(rest)
                ) {
                  // < in plain text, be forgiving and treat it as text
                  next = rest.indexOf('<', 1);
                  if (next < 0) { break }
                  textEnd += next;
                  rest = html.slice(textEnd);
                }
                text = html.substring(0, textEnd);
              }

              if (textEnd < 0) {
                text = html;
              }

              if (text) {
                advance(text.length);
              }

              if (options.chars && text) {
                options.chars(text, index - text.length, index);
              }
            } else {
              var endTagLength = 0;
              var stackedTag = lastTag.toLowerCase();
              var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
              var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
                endTagLength = endTag.length;
                if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                  text = text
                    .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
                    .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                }
                if (shouldIgnoreFirstNewline(stackedTag, text)) {
                  text = text.slice(1);
                }
                if (options.chars) {
                  options.chars(text);
                }
                return ''
              });
              index += html.length - rest$1.length;
              html = rest$1;
              parseEndTag(stackedTag, index - endTagLength, index);
            }

            if (html === last) {
              options.chars && options.chars(html);
              if (!stack.length && options.warn) {
                options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
              }
              break
            }
          }

          // Clean up any remaining tags
          parseEndTag();

          function advance (n) {
            index += n;
            html = html.substring(n);
          }

          function parseStartTag () {
            var start = html.match(startTagOpen);
            if (start) {
              var match = {
                tagName: start[1],
                attrs: [],
                start: index
              };
              advance(start[0].length);
              var end, attr;
              while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
                attr.start = index;
                advance(attr[0].length);
                attr.end = index;
                match.attrs.push(attr);
              }
              if (end) {
                match.unarySlash = end[1];
                advance(end[0].length);
                match.end = index;
                return match
              }
            }
          }

          function handleStartTag (match) {
            var tagName = match.tagName;
            var unarySlash = match.unarySlash;

            if (expectHTML) {
              if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                parseEndTag(lastTag);
              }
              if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                parseEndTag(tagName);
              }
            }

            var unary = isUnaryTag$$1(tagName) || !!unarySlash;

            var l = match.attrs.length;
            var attrs = new Array(l);
            for (var i = 0; i < l; i++) {
              var args = match.attrs[i];
              var value = args[3] || args[4] || args[5] || '';
              var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
                ? options.shouldDecodeNewlinesForHref
                : options.shouldDecodeNewlines;
              attrs[i] = {
                name: args[1],
                value: decodeAttr(value, shouldDecodeNewlines)
              };
              if (options.outputSourceRange) {
                attrs[i].start = args.start + args[0].match(/^\s*/).length;
                attrs[i].end = args.end;
              }
            }

            if (!unary) {
              stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs, start: match.start, end: match.end });
              lastTag = tagName;
            }

            if (options.start) {
              options.start(tagName, attrs, unary, match.start, match.end);
            }
          }

          function parseEndTag (tagName, start, end) {
            var pos, lowerCasedTagName;
            if (start == null) { start = index; }
            if (end == null) { end = index; }

            // Find the closest opened tag of the same type
            if (tagName) {
              lowerCasedTagName = tagName.toLowerCase();
              for (pos = stack.length - 1; pos >= 0; pos--) {
                if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                  break
                }
              }
            } else {
              // If no tag name is provided, clean shop
              pos = 0;
            }

            if (pos >= 0) {
              // Close all the open elements, up the stack
              for (var i = stack.length - 1; i >= pos; i--) {
                if (i > pos || !tagName &&
                  options.warn
                ) {
                  options.warn(
                    ("tag <" + (stack[i].tag) + "> has no matching end tag."),
                    { start: stack[i].start, end: stack[i].end }
                  );
                }
                if (options.end) {
                  options.end(stack[i].tag, start, end);
                }
              }

              // Remove the open elements from the stack
              stack.length = pos;
              lastTag = pos && stack[pos - 1].tag;
            } else if (lowerCasedTagName === 'br') {
              if (options.start) {
                options.start(tagName, [], true, start, end);
              }
            } else if (lowerCasedTagName === 'p') {
              if (options.start) {
                options.start(tagName, [], false, start, end);
              }
              if (options.end) {
                options.end(tagName, start, end);
              }
            }
          }
        }

        /*  */

        var onRE = /^@|^v-on:/;
        var dirRE = /^v-|^@|^:|^#/;
        var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
        var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
        var stripParensRE = /^\(|\)$/g;
        var dynamicArgRE = /^\[.*\]$/;

        var argRE = /:(.*)$/;
        var bindRE = /^:|^\.|^v-bind:/;
        var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;

        var slotRE = /^v-slot(:|$)|^#/;

        var lineBreakRE = /[\r\n]/;
        var whitespaceRE$1 = /[ \f\t\r\n]+/g;

        var invalidAttributeRE = /[\s"'<>\/=]/;

        var decodeHTMLCached = cached(he.decode);

        var emptySlotScopeToken = "_empty_";

        // configurable state
        var warn$2;
        var delimiters;
        var transforms;
        var preTransforms;
        var postTransforms;
        var platformIsPreTag;
        var platformMustUseProp;
        var platformGetTagNamespace;
        var maybeComponent;

        function createASTElement (
          tag,
          attrs,
          parent
        ) {
          return {
            type: 1,
            tag: tag,
            attrsList: attrs,
            attrsMap: makeAttrsMap(attrs),
            rawAttrsMap: {},
            parent: parent,
            children: []
          }
        }

        /**
         * Convert HTML string to AST.
         */
        function parse (
          template,
          options
        ) {
          warn$2 = options.warn || baseWarn;

          platformIsPreTag = options.isPreTag || no;
          platformMustUseProp = options.mustUseProp || no;
          platformGetTagNamespace = options.getTagNamespace || no;
          var isReservedTag = options.isReservedTag || no;
          maybeComponent = function (el) {
            return !!(
              el.component ||
              el.attrsMap[':is'] ||
              el.attrsMap['v-bind:is'] ||
              !(el.attrsMap.is ? isReservedTag(el.attrsMap.is) : isReservedTag(el.tag))
            );
          };
          transforms = pluckModuleFunction(options.modules, 'transformNode');
          preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
          postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');

          delimiters = options.delimiters;

          var stack = [];
          var preserveWhitespace = options.preserveWhitespace !== false;
          var whitespaceOption = options.whitespace;
          var root;
          var currentParent;
          var inVPre = false;
          var inPre = false;
          var warned = false;

          function warnOnce (msg, range) {
            if (!warned) {
              warned = true;
              warn$2(msg, range);
            }
          }

          function closeElement (element) {
            trimEndingWhitespace(element);
            if (!inVPre && !element.processed) {
              element = processElement(element, options);
            }
            // tree management
            if (!stack.length && element !== root) {
              // allow root elements with v-if, v-else-if and v-else
              if (root.if && (element.elseif || element.else)) {
                {
                  checkRootConstraints(element);
                }
                addIfCondition(root, {
                  exp: element.elseif,
                  block: element
                });
              } else {
                warnOnce(
                  "Component template should contain exactly one root element. " +
                  "If you are using v-if on multiple elements, " +
                  "use v-else-if to chain them instead.",
                  { start: element.start }
                );
              }
            }
            if (currentParent && !element.forbidden) {
              if (element.elseif || element.else) {
                processIfConditions(element, currentParent);
              } else {
                if (element.slotScope) {
                  // scoped slot
                  // keep it in the children list so that v-else(-if) conditions can
                  // find it as the prev node.
                  var name = element.slotTarget || '"default"'
                    ; (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                }
                currentParent.children.push(element);
                element.parent = currentParent;
              }
            }

            // final children cleanup
            // filter out scoped slots
            element.children = element.children.filter(function (c) { return !(c).slotScope; });
            // remove trailing whitespace node again
            trimEndingWhitespace(element);

            // check pre state
            if (element.pre) {
              inVPre = false;
            }
            if (platformIsPreTag(element.tag)) {
              inPre = false;
            }
            // apply post-transforms
            for (var i = 0; i < postTransforms.length; i++) {
              postTransforms[i](element, options);
            }
          }

          function trimEndingWhitespace (el) {
            // remove trailing whitespace node
            if (!inPre) {
              var lastNode;
              while (
                (lastNode = el.children[el.children.length - 1]) &&
                lastNode.type === 3 &&
                lastNode.text === ' '
              ) {
                el.children.pop();
              }
            }
          }

          function checkRootConstraints (el) {
            if (el.tag === 'slot' || el.tag === 'template') {
              warnOnce(
                "Cannot use <" + (el.tag) + "> as component root element because it may " +
                'contain multiple nodes.',
                { start: el.start }
              );
            }
            if (el.attrsMap.hasOwnProperty('v-for')) {
              warnOnce(
                'Cannot use v-for on stateful component root element because ' +
                'it renders multiple elements.',
                el.rawAttrsMap['v-for']
              );
            }
          }

          parseHTML(template, {
            warn: warn$2,
            expectHTML: options.expectHTML,
            isUnaryTag: options.isUnaryTag,
            canBeLeftOpenTag: options.canBeLeftOpenTag,
            shouldDecodeNewlines: options.shouldDecodeNewlines,
            shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
            shouldKeepComment: options.comments,
            outputSourceRange: options.outputSourceRange,
            start: function start (tag, attrs, unary, start$1, end) {
              // check namespace.
              // inherit parent ns if there is one
              var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

              // handle IE svg bug
              /* istanbul ignore if */
              if (isIE && ns === 'svg') {
                attrs = guardIESVGBug(attrs);
              }

              var element = createASTElement(tag, attrs, currentParent);
              if (ns) {
                element.ns = ns;
              }

              {
                if (options.outputSourceRange) {
                  element.start = start$1;
                  element.end = end;
                  element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
                    cumulated[attr.name] = attr;
                    return cumulated
                  }, {});
                }
                attrs.forEach(function (attr) {
                  if (invalidAttributeRE.test(attr.name)) {
                    warn$2(
                      "Invalid dynamic argument expression: attribute names cannot contain " +
                      "spaces, quotes, <, >, / or =.",
                      {
                        start: attr.start + attr.name.indexOf("["),
                        end: attr.start + attr.name.length
                      }
                    );
                  }
                });
              }

              if (isForbiddenTag(element) && !isServerRendering()) {
                element.forbidden = true;
                warn$2(
                  'Templates should only be responsible for mapping the state to the ' +
                  'UI. Avoid placing tags with side-effects in your templates, such as ' +
                  "<" + tag + ">" + ', as they will not be parsed.',
                  { start: element.start }
                );
              }

              // apply pre-transforms
              for (var i = 0; i < preTransforms.length; i++) {
                element = preTransforms[i](element, options) || element;
              }

              if (!inVPre) {
                processPre(element);
                if (element.pre) {
                  inVPre = true;
                }
              }
              if (platformIsPreTag(element.tag)) {
                inPre = true;
              }
              if (inVPre) {
                processRawAttrs(element);
              } else if (!element.processed) {
                // structural directives
                processFor(element);
                processIf(element);
                processOnce(element);
              }

              if (!root) {
                root = element;
                {
                  checkRootConstraints(root);
                }
              }

              if (!unary) {
                currentParent = element;
                stack.push(element);
              } else {
                closeElement(element);
              }
            },

            end: function end (tag, start, end$1) {
              var element = stack[stack.length - 1];
              // pop stack
              stack.length -= 1;
              currentParent = stack[stack.length - 1];
              if (options.outputSourceRange) {
                element.end = end$1;
              }
              closeElement(element);
            },

            chars: function chars (text, start, end) {
              if (!currentParent) {
                {
                  if (text === template) {
                    warnOnce(
                      'Component template requires a root element, rather than just text.',
                      { start: start }
                    );
                  } else if ((text = text.trim())) {
                    warnOnce(
                      ("text \"" + text + "\" outside root element will be ignored."),
                      { start: start }
                    );
                  }
                }
                return
              }
              // IE textarea placeholder bug
              /* istanbul ignore if */
              if (isIE &&
                currentParent.tag === 'textarea' &&
                currentParent.attrsMap.placeholder === text
              ) {
                return
              }
              var children = currentParent.children;
              if (inPre || text.trim()) {
                text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
              } else if (!children.length) {
                // remove the whitespace-only node right after an opening tag
                text = '';
              } else if (whitespaceOption) {
                if (whitespaceOption === 'condense') {
                  // in condense mode, remove the whitespace node if it contains
                  // line break, otherwise condense to a single space
                  text = lineBreakRE.test(text) ? '' : ' ';
                } else {
                  text = ' ';
                }
              } else {
                text = preserveWhitespace ? ' ' : '';
              }
              if (text) {
                if (!inPre && whitespaceOption === 'condense') {
                  // condense consecutive whitespaces into single space
                  text = text.replace(whitespaceRE$1, ' ');
                }
                var res;
                var child;
                if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
                  child = {
                    type: 2,
                    expression: res.expression,
                    tokens: res.tokens,
                    text: text
                  };
                } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                  child = {
                    type: 3,
                    text: text
                  };
                }
                if (child) {
                  if (options.outputSourceRange) {
                    child.start = start;
                    child.end = end;
                  }
                  children.push(child);
                }
              }
            },
            comment: function comment (text, start, end) {
              // adding anything as a sibling to the root node is forbidden
              // comments should still be allowed, but ignored
              if (currentParent) {
                var child = {
                  type: 3,
                  text: text,
                  isComment: true
                };
                if (options.outputSourceRange) {
                  child.start = start;
                  child.end = end;
                }
                currentParent.children.push(child);
              }
            }
          });
          return root
        }

        function processPre (el) {
          if (getAndRemoveAttr(el, 'v-pre') != null) {
            el.pre = true;
          }
        }

        function processRawAttrs (el) {
          var list = el.attrsList;
          var len = list.length;
          if (len) {
            var attrs = el.attrs = new Array(len);
            for (var i = 0; i < len; i++) {
              attrs[i] = {
                name: list[i].name,
                value: JSON.stringify(list[i].value)
              };
              if (list[i].start != null) {
                attrs[i].start = list[i].start;
                attrs[i].end = list[i].end;
              }
            }
          } else if (!el.pre) {
            // non root node in pre blocks with no attributes
            el.plain = true;
          }
        }

        function processElement (
          element,
          options
        ) {
          processKey(element);

          // determine whether this is a plain element after
          // removing structural attributes
          element.plain = (
            !element.key &&
            !element.scopedSlots &&
            !element.attrsList.length
          );

          processRef(element);
          processSlotContent(element);
          processSlotOutlet(element);
          processComponent(element);
          for (var i = 0; i < transforms.length; i++) {
            element = transforms[i](element, options) || element;
          }
          processAttrs(element);
          return element
        }

        function processKey (el) {
          var exp = getBindingAttr(el, 'key');
          if (exp) {
            {
              if (el.tag === 'template') {
                warn$2(
                  "<template> cannot be keyed. Place the key on real elements instead.",
                  getRawBindingAttr(el, 'key')
                );
              }
              if (el.for) {
                var iterator = el.iterator2 || el.iterator1;
                var parent = el.parent;
                if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
                  warn$2(
                    "Do not use v-for index as key on <transition-group> children, " +
                    "this is the same as not using keys.",
                    getRawBindingAttr(el, 'key'),
                    true /* tip */
                  );
                }
              }
            }
            el.key = exp;
          }
        }

        function processRef (el) {
          var ref = getBindingAttr(el, 'ref');
          if (ref) {
            el.ref = ref;
            el.refInFor = checkInFor(el);
          }
        }

        function processFor (el) {
          var exp;
          if ((exp = getAndRemoveAttr(el, 'v-for'))) {
            var res = parseFor(exp);
            if (res) {
              extend(el, res);
            } else {
              warn$2(
                ("Invalid v-for expression: " + exp),
                el.rawAttrsMap['v-for']
              );
            }
          }
        }



        function parseFor (exp) {
          var inMatch = exp.match(forAliasRE);
          if (!inMatch) { return }
          var res = {};
          res.for = inMatch[2].trim();
          var alias = inMatch[1].trim().replace(stripParensRE, '');
          var iteratorMatch = alias.match(forIteratorRE);
          if (iteratorMatch) {
            res.alias = alias.replace(forIteratorRE, '').trim();
            res.iterator1 = iteratorMatch[1].trim();
            if (iteratorMatch[2]) {
              res.iterator2 = iteratorMatch[2].trim();
            }
          } else {
            res.alias = alias;
          }
          return res
        }

        function processIf (el) {
          var exp = getAndRemoveAttr(el, 'v-if');
          if (exp) {
            el.if = exp;
            addIfCondition(el, {
              exp: exp,
              block: el
            });
          } else {
            if (getAndRemoveAttr(el, 'v-else') != null) {
              el.else = true;
            }
            var elseif = getAndRemoveAttr(el, 'v-else-if');
            if (elseif) {
              el.elseif = elseif;
            }
          }
        }

        function processIfConditions (el, parent) {
          var prev = findPrevElement(parent.children);
          if (prev && prev.if) {
            addIfCondition(prev, {
              exp: el.elseif,
              block: el
            });
          } else {
            warn$2(
              "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
              "used on element <" + (el.tag) + "> without corresponding v-if.",
              el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']
            );
          }
        }

        function findPrevElement (children) {
          var i = children.length;
          while (i--) {
            if (children[i].type === 1) {
              return children[i]
            } else {
              if (children[i].text !== ' ') {
                warn$2(
                  "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                  "will be ignored.",
                  children[i]
                );
              }
              children.pop();
            }
          }
        }

        function addIfCondition (el, condition) {
          if (!el.ifConditions) {
            el.ifConditions = [];
          }
          el.ifConditions.push(condition);
        }

        function processOnce (el) {
          var once$$1 = getAndRemoveAttr(el, 'v-once');
          if (once$$1 != null) {
            el.once = true;
          }
        }

        // handle content being passed to a component as slot,
        // e.g. <template slot="xxx">, <div slot-scope="xxx">
        function processSlotContent (el) {
          var slotScope;
          if (el.tag === 'template') {
            slotScope = getAndRemoveAttr(el, 'scope');
            /* istanbul ignore if */
            if (slotScope) {
              warn$2(
                "the \"scope\" attribute for scoped slots have been deprecated and " +
                "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
                "can also be used on plain elements in addition to <template> to " +
                "denote scoped slots.",
                el.rawAttrsMap['scope'],
                true
              );
            }
            el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
          } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
            /* istanbul ignore if */
            if (el.attrsMap['v-for']) {
              warn$2(
                "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
                "(v-for takes higher priority). Use a wrapper <template> for the " +
                "scoped slot to make it clearer.",
                el.rawAttrsMap['slot-scope'],
                true
              );
            }
            el.slotScope = slotScope;
          }

          // slot="xxx"
          var slotTarget = getBindingAttr(el, 'slot');
          if (slotTarget) {
            el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
            el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
            // preserve slot as an attribute for native shadow DOM compat
            // only for non-scoped slots.
            if (el.tag !== 'template' && !el.slotScope) {
              addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
            }
          }

          // 2.6 v-slot syntax
          {
            if (el.tag === 'template') {
              // v-slot on <template>
              var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
              if (slotBinding) {
                {
                  if (el.slotTarget || el.slotScope) {
                    warn$2(
                      "Unexpected mixed usage of different slot syntaxes.",
                      el
                    );
                  }
                  if (el.parent && !maybeComponent(el.parent)) {
                    warn$2(
                      "<template v-slot> can only appear at the root level inside " +
                      "the receiving component",
                      el
                    );
                  }
                }
                var ref = getSlotName(slotBinding);
                var name = ref.name;
                var dynamic = ref.dynamic;
                el.slotTarget = name;
                el.slotTargetDynamic = dynamic;
                el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
              }
            } else {
              // v-slot on component, denotes default slot
              var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
              if (slotBinding$1) {
                {
                  if (!maybeComponent(el)) {
                    warn$2(
                      "v-slot can only be used on components or <template>.",
                      slotBinding$1
                    );
                  }
                  if (el.slotScope || el.slotTarget) {
                    warn$2(
                      "Unexpected mixed usage of different slot syntaxes.",
                      el
                    );
                  }
                  if (el.scopedSlots) {
                    warn$2(
                      "To avoid scope ambiguity, the default slot should also use " +
                      "<template> syntax when there are other named slots.",
                      slotBinding$1
                    );
                  }
                }
                // add the component's children to its default slot
                var slots = el.scopedSlots || (el.scopedSlots = {});
                var ref$1 = getSlotName(slotBinding$1);
                var name$1 = ref$1.name;
                var dynamic$1 = ref$1.dynamic;
                var slotContainer = slots[name$1] = createASTElement('template', [], el);
                slotContainer.slotTarget = name$1;
                slotContainer.slotTargetDynamic = dynamic$1;
                slotContainer.children = el.children.filter(function (c) {
                  if (!c.slotScope) {
                    c.parent = slotContainer;
                    return true
                  }
                });
                slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
                // remove children as they are returned from scopedSlots now
                el.children = [];
                // mark el non-plain so data gets generated
                el.plain = false;
              }
            }
          }
        }

        function getSlotName (binding) {
          var name = binding.name.replace(slotRE, '');
          if (!name) {
            if (binding.name[0] !== '#') {
              name = 'default';
            } else {
              warn$2(
                "v-slot shorthand syntax requires a slot name.",
                binding
              );
            }
          }
          return dynamicArgRE.test(name)
            // dynamic [name]
            ? { name: name.slice(1, -1), dynamic: true }
            // static name
            : { name: ("\"" + name + "\""), dynamic: false }
        }

        // handle <slot/> outlets
        function processSlotOutlet (el) {
          if (el.tag === 'slot') {
            el.slotName = getBindingAttr(el, 'name');
            if (el.key) {
              warn$2(
                "`key` does not work on <slot> because slots are abstract outlets " +
                "and can possibly expand into multiple elements. " +
                "Use the key on a wrapping element instead.",
                getRawBindingAttr(el, 'key')
              );
            }
          }
        }

        function processComponent (el) {
          var binding;
          if ((binding = getBindingAttr(el, 'is'))) {
            el.component = binding;
          }
          if (getAndRemoveAttr(el, 'inline-template') != null) {
            el.inlineTemplate = true;
          }
        }

        function processAttrs (el) {
          var list = el.attrsList;
          var i, l, name, rawName, value, modifiers, syncGen, isDynamic;
          for (i = 0, l = list.length; i < l; i++) {
            name = rawName = list[i].name;
            value = list[i].value;
            if (dirRE.test(name)) {
              // mark element as dynamic
              el.hasBindings = true;
              // modifiers
              modifiers = parseModifiers(name.replace(dirRE, ''));
              // support .foo shorthand syntax for the .prop modifier
              if (modifiers) {
                name = name.replace(modifierRE, '');
              }
              if (bindRE.test(name)) { // v-bind
                name = name.replace(bindRE, '');
                value = parseFilters(value);
                isDynamic = dynamicArgRE.test(name);
                if (isDynamic) {
                  name = name.slice(1, -1);
                }
                if (
                  value.trim().length === 0
                ) {
                  warn$2(
                    ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
                  );
                }
                if (modifiers) {
                  if (modifiers.prop && !isDynamic) {
                    name = camelize(name);
                    if (name === 'innerHtml') { name = 'innerHTML'; }
                  }
                  if (modifiers.camel && !isDynamic) {
                    name = camelize(name);
                  }
                  if (modifiers.sync) {
                    syncGen = genAssignmentCode(value, "$event");
                    if (!isDynamic) {
                      addHandler(
                        el,
                        ("update:" + (camelize(name))),
                        syncGen,
                        null,
                        false,
                        warn$2,
                        list[i]
                      );
                      if (hyphenate(name) !== camelize(name)) {
                        addHandler(
                          el,
                          ("update:" + (hyphenate(name))),
                          syncGen,
                          null,
                          false,
                          warn$2,
                          list[i]
                        );
                      }
                    } else {
                      // handler w/ dynamic event name
                      addHandler(
                        el,
                        ("\"update:\"+(" + name + ")"),
                        syncGen,
                        null,
                        false,
                        warn$2,
                        list[i],
                        true // dynamic
                      );
                    }
                  }
                }
                if ((modifiers && modifiers.prop) || (
                  !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
                )) {
                  addProp(el, name, value, list[i], isDynamic);
                } else {
                  addAttr(el, name, value, list[i], isDynamic);
                }
              } else if (onRE.test(name)) { // v-on
                name = name.replace(onRE, '');
                isDynamic = dynamicArgRE.test(name);
                if (isDynamic) {
                  name = name.slice(1, -1);
                }
                addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
              } else { // normal directives
                name = name.replace(dirRE, '');
                // parse arg
                var argMatch = name.match(argRE);
                var arg = argMatch && argMatch[1];
                isDynamic = false;
                if (arg) {
                  name = name.slice(0, -(arg.length + 1));
                  if (dynamicArgRE.test(arg)) {
                    arg = arg.slice(1, -1);
                    isDynamic = true;
                  }
                }
                addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
                if (name === 'model') {
                  checkForAliasModel(el, value);
                }
              }
            } else {
              // literal attribute
              {
                var res = parseText(value, delimiters);
                if (res) {
                  warn$2(
                    name + "=\"" + value + "\": " +
                    'Interpolation inside attributes has been removed. ' +
                    'Use v-bind or the colon shorthand instead. For example, ' +
                    'instead of <div id="{{ val }}">, use <div :id="val">.',
                    list[i]
                  );
                }
              }
              addAttr(el, name, JSON.stringify(value), list[i]);
              // #6887 firefox doesn't update muted state if set via attribute
              // even immediately after element creation
              if (!el.component &&
                name === 'muted' &&
                platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                addProp(el, name, 'true', list[i]);
              }
            }
          }
        }

        function checkInFor (el) {
          var parent = el;
          while (parent) {
            if (parent.for !== undefined) {
              return true
            }
            parent = parent.parent;
          }
          return false
        }

        function parseModifiers (name) {
          var match = name.match(modifierRE);
          if (match) {
            var ret = {};
            match.forEach(function (m) { ret[m.slice(1)] = true; });
            return ret
          }
        }

        function makeAttrsMap (attrs) {
          var map = {};
          for (var i = 0, l = attrs.length; i < l; i++) {
            if (
              map[attrs[i].name] && !isIE && !isEdge
            ) {
              warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
            }
            map[attrs[i].name] = attrs[i].value;
          }
          return map
        }

        // for script (e.g. type="x/template") or style, do not decode content
        function isTextTag (el) {
          return el.tag === 'script' || el.tag === 'style'
        }

        function isForbiddenTag (el) {
          return (
            el.tag === 'style' ||
            (el.tag === 'script' && (
              !el.attrsMap.type ||
              el.attrsMap.type === 'text/javascript'
            ))
          )
        }

        var ieNSBug = /^xmlns:NS\d+/;
        var ieNSPrefix = /^NS\d+:/;

        /* istanbul ignore next */
        function guardIESVGBug (attrs) {
          var res = [];
          for (var i = 0; i < attrs.length; i++) {
            var attr = attrs[i];
            if (!ieNSBug.test(attr.name)) {
              attr.name = attr.name.replace(ieNSPrefix, '');
              res.push(attr);
            }
          }
          return res
        }

        function checkForAliasModel (el, value) {
          var _el = el;
          while (_el) {
            if (_el.for && _el.alias === value) {
              warn$2(
                "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                "You are binding v-model directly to a v-for iteration alias. " +
                "This will not be able to modify the v-for source array because " +
                "writing to the alias is like modifying a function local variable. " +
                "Consider using an array of objects and use v-model on an object property instead.",
                el.rawAttrsMap['v-model']
              );
            }
            _el = _el.parent;
          }
        }

        /*  */

        function preTransformNode (el, options) {
          if (el.tag === 'input') {
            var map = el.attrsMap;
            if (!map['v-model']) {
              return
            }

            var typeBinding;
            if (map[':type'] || map['v-bind:type']) {
              typeBinding = getBindingAttr(el, 'type');
            }
            if (!map.type && !typeBinding && map['v-bind']) {
              typeBinding = "(" + (map['v-bind']) + ").type";
            }

            if (typeBinding) {
              var ifCondition = getAndRemoveAttr(el, 'v-if', true);
              var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
              var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
              var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
              // 1. checkbox
              var branch0 = cloneASTElement(el);
              // process for on the main node
              processFor(branch0);
              addRawAttr(branch0, 'type', 'checkbox');
              processElement(branch0, options);
              branch0.processed = true; // prevent it from double-processed
              branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
              addIfCondition(branch0, {
                exp: branch0.if,
                block: branch0
              });
              // 2. add radio else-if condition
              var branch1 = cloneASTElement(el);
              getAndRemoveAttr(branch1, 'v-for', true);
              addRawAttr(branch1, 'type', 'radio');
              processElement(branch1, options);
              addIfCondition(branch0, {
                exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
                block: branch1
              });
              // 3. other
              var branch2 = cloneASTElement(el);
              getAndRemoveAttr(branch2, 'v-for', true);
              addRawAttr(branch2, ':type', typeBinding);
              processElement(branch2, options);
              addIfCondition(branch0, {
                exp: ifCondition,
                block: branch2
              });

              if (hasElse) {
                branch0.else = true;
              } else if (elseIfCondition) {
                branch0.elseif = elseIfCondition;
              }

              return branch0
            }
          }
        }

        function cloneASTElement (el) {
          return createASTElement(el.tag, el.attrsList.slice(), el.parent)
        }

        var model$1 = {
          preTransformNode: preTransformNode
        };

        var modules$1 = [
          klass$1,
          style$1,
          model$1
        ];

        /*  */

        function text (el, dir) {
          if (dir.value) {
            addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
          }
        }

        /*  */

        function html (el, dir) {
          if (dir.value) {
            addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
          }
        }

        var directives$1 = {
          model: model,
          text: text,
          html: html
        };

        /*  */

        var baseOptions = {
          expectHTML: true,
          modules: modules$1,
          directives: directives$1,
          isPreTag: isPreTag,
          isUnaryTag: isUnaryTag,
          mustUseProp: mustUseProp,
          canBeLeftOpenTag: canBeLeftOpenTag,
          isReservedTag: isReservedTag,
          getTagNamespace: getTagNamespace,
          staticKeys: genStaticKeys(modules$1)
        };

        /*  */

        var isStaticKey;
        var isPlatformReservedTag;

        var genStaticKeysCached = cached(genStaticKeys$1);

        /**
         * Goal of the optimizer: walk the generated template AST tree
         * and detect sub-trees that are purely static, i.e. parts of
         * the DOM that never needs to change.
         *
         * Once we detect these sub-trees, we can:
         *
         * 1. Hoist them into constants, so that we no longer need to
         *    create fresh nodes for them on each re-render;
         * 2. Completely skip them in the patching process.
         */
        function optimize (root, options) {
          if (!root) { return }
          isStaticKey = genStaticKeysCached(options.staticKeys || '');
          isPlatformReservedTag = options.isReservedTag || no;
          // first pass: mark all non-static nodes.
          markStatic$1(root);
          // second pass: mark static roots.
          markStaticRoots(root, false);
        }

        function genStaticKeys$1 (keys) {
          return makeMap(
            'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
            (keys ? ',' + keys : '')
          )
        }

        function markStatic$1 (node) {
          node.static = isStatic(node);
          if (node.type === 1) {
            // do not make component slot content static. this avoids
            // 1. components not able to mutate slot nodes
            // 2. static slot content fails for hot-reloading
            if (
              !isPlatformReservedTag(node.tag) &&
              node.tag !== 'slot' &&
              node.attrsMap['inline-template'] == null
            ) {
              return
            }
            for (var i = 0, l = node.children.length; i < l; i++) {
              var child = node.children[i];
              markStatic$1(child);
              if (!child.static) {
                node.static = false;
              }
            }
            if (node.ifConditions) {
              for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                var block = node.ifConditions[i$1].block;
                markStatic$1(block);
                if (!block.static) {
                  node.static = false;
                }
              }
            }
          }
        }

        function markStaticRoots (node, isInFor) {
          if (node.type === 1) {
            if (node.static || node.once) {
              node.staticInFor = isInFor;
            }
            // For a node to qualify as a static root, it should have children that
            // are not just static text. Otherwise the cost of hoisting out will
            // outweigh the benefits and it's better off to just always render it fresh.
            if (node.static && node.children.length && !(
              node.children.length === 1 &&
              node.children[0].type === 3
            )) {
              node.staticRoot = true;
              return
            } else {
              node.staticRoot = false;
            }
            if (node.children) {
              for (var i = 0, l = node.children.length; i < l; i++) {
                markStaticRoots(node.children[i], isInFor || !!node.for);
              }
            }
            if (node.ifConditions) {
              for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                markStaticRoots(node.ifConditions[i$1].block, isInFor);
              }
            }
          }
        }

        function isStatic (node) {
          if (node.type === 2) { // expression
            return false
          }
          if (node.type === 3) { // text
            return true
          }
          return !!(node.pre || (
            !node.hasBindings && // no dynamic bindings
            !node.if && !node.for && // not v-if or v-for or v-else
            !isBuiltInTag(node.tag) && // not a built-in
            isPlatformReservedTag(node.tag) && // not a component
            !isDirectChildOfTemplateFor(node) &&
            Object.keys(node).every(isStaticKey)
          ))
        }

        function isDirectChildOfTemplateFor (node) {
          while (node.parent) {
            node = node.parent;
            if (node.tag !== 'template') {
              return false
            }
            if (node.for) {
              return true
            }
          }
          return false
        }

        /*  */

        var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function(?:\s+[\w$]+)?\s*\(/;
        var fnInvokeRE = /\([^)]*?\);*$/;
        var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;

        // KeyboardEvent.keyCode aliases
        var keyCodes = {
          esc: 27,
          tab: 9,
          enter: 13,
          space: 32,
          up: 38,
          left: 37,
          right: 39,
          down: 40,
          'delete': [8, 46]
        };

        // KeyboardEvent.key aliases
        var keyNames = {
          // #7880: IE11 and Edge use `Esc` for Escape key name.
          esc: ['Esc', 'Escape'],
          tab: 'Tab',
          enter: 'Enter',
          // #9112: IE11 uses `Spacebar` for Space key name.
          space: [' ', 'Spacebar'],
          // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
          up: ['Up', 'ArrowUp'],
          left: ['Left', 'ArrowLeft'],
          right: ['Right', 'ArrowRight'],
          down: ['Down', 'ArrowDown'],
          // #9112: IE11 uses `Del` for Delete key name.
          'delete': ['Backspace', 'Delete', 'Del']
        };

        // #4868: modifiers that prevent the execution of the listener
        // need to explicitly return null so that we can determine whether to remove
        // the listener for .once
        var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };

        var modifierCode = {
          stop: '$event.stopPropagation();',
          prevent: '$event.preventDefault();',
          self: genGuard("$event.target !== $event.currentTarget"),
          ctrl: genGuard("!$event.ctrlKey"),
          shift: genGuard("!$event.shiftKey"),
          alt: genGuard("!$event.altKey"),
          meta: genGuard("!$event.metaKey"),
          left: genGuard("'button' in $event && $event.button !== 0"),
          middle: genGuard("'button' in $event && $event.button !== 1"),
          right: genGuard("'button' in $event && $event.button !== 2")
        };

        function genHandlers (
          events,
          isNative
        ) {
          var prefix = isNative ? 'nativeOn:' : 'on:';
          var staticHandlers = "";
          var dynamicHandlers = "";
          for (var name in events) {
            var handlerCode = genHandler(events[name]);
            if (events[name] && events[name].dynamic) {
              dynamicHandlers += name + "," + handlerCode + ",";
            } else {
              staticHandlers += "\"" + name + "\":" + handlerCode + ",";
            }
          }
          staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
          if (dynamicHandlers) {
            return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
          } else {
            return prefix + staticHandlers
          }
        }

        function genHandler (handler) {
          if (!handler) {
            return 'function(){}'
          }

          if (Array.isArray(handler)) {
            return ("[" + (handler.map(function (handler) { return genHandler(handler); }).join(',')) + "]")
          }

          var isMethodPath = simplePathRE.test(handler.value);
          var isFunctionExpression = fnExpRE.test(handler.value);
          var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));

          if (!handler.modifiers) {
            if (isMethodPath || isFunctionExpression) {
              return handler.value
            }
            return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
          } else {
            var code = '';
            var genModifierCode = '';
            var keys = [];
            for (var key in handler.modifiers) {
              if (modifierCode[key]) {
                genModifierCode += modifierCode[key];
                // left/right
                if (keyCodes[key]) {
                  keys.push(key);
                }
              } else if (key === 'exact') {
                var modifiers = (handler.modifiers);
                genModifierCode += genGuard(
                  ['ctrl', 'shift', 'alt', 'meta']
                    .filter(function (keyModifier) { return !modifiers[keyModifier]; })
                    .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
                    .join('||')
                );
              } else {
                keys.push(key);
              }
            }
            if (keys.length) {
              code += genKeyFilter(keys);
            }
            // Make sure modifiers like prevent and stop get executed after key filtering
            if (genModifierCode) {
              code += genModifierCode;
            }
            var handlerCode = isMethodPath
              ? ("return " + (handler.value) + ".apply(null, arguments)")
              : isFunctionExpression
                ? ("return (" + (handler.value) + ").apply(null, arguments)")
                : isFunctionInvocation
                  ? ("return " + (handler.value))
                  : handler.value;
            return ("function($event){" + code + handlerCode + "}")
          }
        }

        function genKeyFilter (keys) {
          return (
            // make sure the key filters only apply to KeyboardEvents
            // #9441: can't use 'keyCode' in $event because Chrome autofill fires fake
            // key events that do not have keyCode property...
            "if(!$event.type.indexOf('key')&&" +
            (keys.map(genFilterCode).join('&&')) + ")return null;"
          )
        }

        function genFilterCode (key) {
          var keyVal = parseInt(key, 10);
          if (keyVal) {
            return ("$event.keyCode!==" + keyVal)
          }
          var keyCode = keyCodes[key];
          var keyName = keyNames[key];
          return (
            "_k($event.keyCode," +
            (JSON.stringify(key)) + "," +
            (JSON.stringify(keyCode)) + "," +
            "$event.key," +
            "" + (JSON.stringify(keyName)) +
            ")"
          )
        }

        /*  */

        function on (el, dir) {
          if (dir.modifiers) {
            warn("v-on without argument does not support modifiers.");
          }
          el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
        }

        /*  */

        function bind$1 (el, dir) {
          el.wrapData = function (code) {
            return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
          };
        }

        /*  */

        var baseDirectives = {
          on: on,
          bind: bind$1,
          cloak: noop
        };

        /*  */





        var CodegenState = function CodegenState (options) {
          this.options = options;
          this.warn = options.warn || baseWarn;
          this.transforms = pluckModuleFunction(options.modules, 'transformCode');
          this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
          this.directives = extend(extend({}, baseDirectives), options.directives);
          var isReservedTag = options.isReservedTag || no;
          this.maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
          this.onceId = 0;
          this.staticRenderFns = [];
          this.pre = false;
        };



        function generate (
          ast,
          options
        ) {
          var state = new CodegenState(options);
          // fix #11483, Root level <script> tags should not be rendered.
          var code = ast ? (ast.tag === 'script' ? 'null' : genElement(ast, state)) : '_c("div")';
          return {
            render: ("with(this){return " + code + "}"),
            staticRenderFns: state.staticRenderFns
          }
        }

        function genElement (el, state) {
          if (el.parent) {
            el.pre = el.pre || el.parent.pre;
          }

          if (el.staticRoot && !el.staticProcessed) {
            return genStatic(el, state)
          } else if (el.once && !el.onceProcessed) {
            return genOnce(el, state)
          } else if (el.for && !el.forProcessed) {
            return genFor(el, state)
          } else if (el.if && !el.ifProcessed) {
            return genIf(el, state)
          } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
            return genChildren(el, state) || 'void 0'
          } else if (el.tag === 'slot') {
            return genSlot(el, state)
          } else {
            // component or element
            var code;
            if (el.component) {
              code = genComponent(el.component, el, state);
            } else {
              var data;
              if (!el.plain || (el.pre && state.maybeComponent(el))) {
                data = genData$2(el, state);
              }

              var children = el.inlineTemplate ? null : genChildren(el, state, true);
              code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
            }
            // module transforms
            for (var i = 0; i < state.transforms.length; i++) {
              code = state.transforms[i](el, code);
            }
            return code
          }
        }

        // hoist static sub-trees out
        function genStatic (el, state) {
          el.staticProcessed = true;
          // Some elements (templates) need to behave differently inside of a v-pre
          // node.  All pre nodes are static roots, so we can use this as a location to
          // wrap a state change and reset it upon exiting the pre node.
          var originalPreState = state.pre;
          if (el.pre) {
            state.pre = el.pre;
          }
          state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
          state.pre = originalPreState;
          return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
        }

        // v-once
        function genOnce (el, state) {
          el.onceProcessed = true;
          if (el.if && !el.ifProcessed) {
            return genIf(el, state)
          } else if (el.staticInFor) {
            var key = '';
            var parent = el.parent;
            while (parent) {
              if (parent.for) {
                key = parent.key;
                break
              }
              parent = parent.parent;
            }
            if (!key) {
              state.warn(
                "v-once can only be used inside v-for that is keyed. ",
                el.rawAttrsMap['v-once']
              );
              return genElement(el, state)
            }
            return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
          } else {
            return genStatic(el, state)
          }
        }

        function genIf (
          el,
          state,
          altGen,
          altEmpty
        ) {
          el.ifProcessed = true; // avoid recursion
          return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
        }

        function genIfConditions (
          conditions,
          state,
          altGen,
          altEmpty
        ) {
          if (!conditions.length) {
            return altEmpty || '_e()'
          }

          var condition = conditions.shift();
          if (condition.exp) {
            return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
          } else {
            return ("" + (genTernaryExp(condition.block)))
          }

          // v-if with v-once should generate code like (a)?_m(0):_m(1)
          function genTernaryExp (el) {
            return altGen
              ? altGen(el, state)
              : el.once
                ? genOnce(el, state)
                : genElement(el, state)
          }
        }

        function genFor (
          el,
          state,
          altGen,
          altHelper
        ) {
          var exp = el.for;
          var alias = el.alias;
          var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
          var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';

          if (state.maybeComponent(el) &&
            el.tag !== 'slot' &&
            el.tag !== 'template' &&
            !el.key
          ) {
            state.warn(
              "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
              "v-for should have explicit keys. " +
              "See https://vuejs.org/guide/list.html#key for more info.",
              el.rawAttrsMap['v-for'],
              true /* tip */
            );
          }

          el.forProcessed = true; // avoid recursion
          return (altHelper || '_l') + "((" + exp + ")," +
            "function(" + alias + iterator1 + iterator2 + "){" +
            "return " + ((altGen || genElement)(el, state)) +
            '})'
        }

        function genData$2 (el, state) {
          var data = '{';

          // directives first.
          // directives may mutate the el's other properties before they are generated.
          var dirs = genDirectives(el, state);
          if (dirs) { data += dirs + ','; }

          // key
          if (el.key) {
            data += "key:" + (el.key) + ",";
          }
          // ref
          if (el.ref) {
            data += "ref:" + (el.ref) + ",";
          }
          if (el.refInFor) {
            data += "refInFor:true,";
          }
          // pre
          if (el.pre) {
            data += "pre:true,";
          }
          // record original tag name for components using "is" attribute
          if (el.component) {
            data += "tag:\"" + (el.tag) + "\",";
          }
          // module data generation functions
          for (var i = 0; i < state.dataGenFns.length; i++) {
            data += state.dataGenFns[i](el);
          }
          // attributes
          if (el.attrs) {
            data += "attrs:" + (genProps(el.attrs)) + ",";
          }
          // DOM props
          if (el.props) {
            data += "domProps:" + (genProps(el.props)) + ",";
          }
          // event handlers
          if (el.events) {
            data += (genHandlers(el.events, false)) + ",";
          }
          if (el.nativeEvents) {
            data += (genHandlers(el.nativeEvents, true)) + ",";
          }
          // slot target
          // only for non-scoped slots
          if (el.slotTarget && !el.slotScope) {
            data += "slot:" + (el.slotTarget) + ",";
          }
          // scoped slots
          if (el.scopedSlots) {
            data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
          }
          // component v-model
          if (el.model) {
            data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
          }
          // inline-template
          if (el.inlineTemplate) {
            var inlineTemplate = genInlineTemplate(el, state);
            if (inlineTemplate) {
              data += inlineTemplate + ",";
            }
          }
          data = data.replace(/,$/, '') + '}';
          // v-bind dynamic argument wrap
          // v-bind with dynamic arguments must be applied using the same v-bind object
          // merge helper so that class/style/mustUseProp attrs are handled correctly.
          if (el.dynamicAttrs) {
            data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
          }
          // v-bind data wrap
          if (el.wrapData) {
            data = el.wrapData(data);
          }
          // v-on data wrap
          if (el.wrapListeners) {
            data = el.wrapListeners(data);
          }
          return data
        }

        function genDirectives (el, state) {
          var dirs = el.directives;
          if (!dirs) { return }
          var res = 'directives:[';
          var hasRuntime = false;
          var i, l, dir, needRuntime;
          for (i = 0, l = dirs.length; i < l; i++) {
            dir = dirs[i];
            needRuntime = true;
            var gen = state.directives[dir.name];
            if (gen) {
              // compile-time directive that manipulates AST.
              // returns true if it also needs a runtime counterpart.
              needRuntime = !!gen(el, dir, state.warn);
            }
            if (needRuntime) {
              hasRuntime = true;
              res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
            }
          }
          if (hasRuntime) {
            return res.slice(0, -1) + ']'
          }
        }

        function genInlineTemplate (el, state) {
          var ast = el.children[0];
          if (el.children.length !== 1 || ast.type !== 1) {
            state.warn(
              'Inline-template components must have exactly one child element.',
              { start: el.start }
            );
          }
          if (ast && ast.type === 1) {
            var inlineRenderFns = generate(ast, state.options);
            return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
          }
        }

        function genScopedSlots (
          el,
          slots,
          state
        ) {
          // by default scoped slots are considered "stable", this allows child
          // components with only scoped slots to skip forced updates from parent.
          // but in some cases we have to bail-out of this optimization
          // for example if the slot contains dynamic names, has v-if or v-for on them...
          var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
            var slot = slots[key];
            return (
              slot.slotTargetDynamic ||
              slot.if ||
              slot.for ||
              containsSlotChild(slot) // is passing down slot from parent which may be dynamic
            )
          });

          // #9534: if a component with scoped slots is inside a conditional branch,
          // it's possible for the same component to be reused but with different
          // compiled slot content. To avoid that, we generate a unique key based on
          // the generated code of all the slot contents.
          var needsKey = !!el.if;

          // OR when it is inside another scoped slot or v-for (the reactivity may be
          // disconnected due to the intermediate scope variable)
          // #9438, #9506
          // TODO: this can be further optimized by properly analyzing in-scope bindings
          // and skip force updating ones that do not actually use scope variables.
          if (!needsForceUpdate) {
            var parent = el.parent;
            while (parent) {
              if (
                (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
                parent.for
              ) {
                needsForceUpdate = true;
                break
              }
              if (parent.if) {
                needsKey = true;
              }
              parent = parent.parent;
            }
          }

          var generatedSlots = Object.keys(slots)
            .map(function (key) { return genScopedSlot(slots[key], state); })
            .join(',');

          return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,false," + (hash(generatedSlots))) : "") + ")")
        }

        function hash (str) {
          var hash = 5381;
          var i = str.length;
          while (i) {
            hash = (hash * 33) ^ str.charCodeAt(--i);
          }
          return hash >>> 0
        }

        function containsSlotChild (el) {
          if (el.type === 1) {
            if (el.tag === 'slot') {
              return true
            }
            return el.children.some(containsSlotChild)
          }
          return false
        }

        function genScopedSlot (
          el,
          state
        ) {
          var isLegacySyntax = el.attrsMap['slot-scope'];
          if (el.if && !el.ifProcessed && !isLegacySyntax) {
            return genIf(el, state, genScopedSlot, "null")
          }
          if (el.for && !el.forProcessed) {
            return genFor(el, state, genScopedSlot)
          }
          var slotScope = el.slotScope === emptySlotScopeToken
            ? ""
            : String(el.slotScope);
          var fn = "function(" + slotScope + "){" +
            "return " + (el.tag === 'template'
              ? el.if && isLegacySyntax
                ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
                : genChildren(el, state) || 'undefined'
              : genElement(el, state)) + "}";
          // reverse proxy v-slot without scope on this.$slots
          var reverseProxy = slotScope ? "" : ",proxy:true";
          return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
        }

        function genChildren (
          el,
          state,
          checkSkip,
          altGenElement,
          altGenNode
        ) {
          var children = el.children;
          if (children.length) {
            var el$1 = children[0];
            // optimize single v-for
            if (children.length === 1 &&
              el$1.for &&
              el$1.tag !== 'template' &&
              el$1.tag !== 'slot'
            ) {
              var normalizationType = checkSkip
                ? state.maybeComponent(el$1) ? ",1" : ",0"
                : "";
              return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
            }
            var normalizationType$1 = checkSkip
              ? getNormalizationType(children, state.maybeComponent)
              : 0;
            var gen = altGenNode || genNode;
            return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
          }
        }

        // determine the normalization needed for the children array.
        // 0: no normalization needed
        // 1: simple normalization needed (possible 1-level deep nested array)
        // 2: full normalization needed
        function getNormalizationType (
          children,
          maybeComponent
        ) {
          var res = 0;
          for (var i = 0; i < children.length; i++) {
            var el = children[i];
            if (el.type !== 1) {
              continue
            }
            if (needsNormalization(el) ||
              (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
              res = 2;
              break
            }
            if (maybeComponent(el) ||
              (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
              res = 1;
            }
          }
          return res
        }

        function needsNormalization (el) {
          return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
        }

        function genNode (node, state) {
          if (node.type === 1) {
            return genElement(node, state)
          } else if (node.type === 3 && node.isComment) {
            return genComment(node)
          } else {
            return genText(node)
          }
        }

        function genText (text) {
          return ("_v(" + (text.type === 2
            ? text.expression // no need for () because already wrapped in _s()
            : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
        }

        function genComment (comment) {
          return ("_e(" + (JSON.stringify(comment.text)) + ")")
        }

        function genSlot (el, state) {
          var slotName = el.slotName || '"default"';
          var children = genChildren(el, state);
          var res = "_t(" + slotName + (children ? (",function(){return " + children + "}") : '');
          var attrs = el.attrs || el.dynamicAttrs
            ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) {
              return ({
                // slot props are camelized
                name: camelize(attr.name),
                value: attr.value,
                dynamic: attr.dynamic
              });
            }))
            : null;
          var bind$$1 = el.attrsMap['v-bind'];
          if ((attrs || bind$$1) && !children) {
            res += ",null";
          }
          if (attrs) {
            res += "," + attrs;
          }
          if (bind$$1) {
            res += (attrs ? '' : ',null') + "," + bind$$1;
          }
          return res + ')'
        }

        // componentName is el.component, take it as argument to shun flow's pessimistic refinement
        function genComponent (
          componentName,
          el,
          state
        ) {
          var children = el.inlineTemplate ? null : genChildren(el, state, true);
          return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
        }

        function genProps (props) {
          var staticProps = "";
          var dynamicProps = "";
          for (var i = 0; i < props.length; i++) {
            var prop = props[i];
            var value = transformSpecialNewlines(prop.value);
            if (prop.dynamic) {
              dynamicProps += (prop.name) + "," + value + ",";
            } else {
              staticProps += "\"" + (prop.name) + "\":" + value + ",";
            }
          }
          staticProps = "{" + (staticProps.slice(0, -1)) + "}";
          if (dynamicProps) {
            return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
          } else {
            return staticProps
          }
        }

        // #3895, #4268
        function transformSpecialNewlines (text) {
          return text
            .replace(/\u2028/g, '\\u2028')
            .replace(/\u2029/g, '\\u2029')
        }

        /*  */



        // these keywords should not appear inside expressions, but operators like
        // typeof, instanceof and in are allowed
        var prohibitedKeywordRE = new RegExp('\\b' + (
          'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
          'super,throw,while,yield,delete,export,import,return,switch,default,' +
          'extends,finally,continue,debugger,function,arguments'
        ).split(',').join('\\b|\\b') + '\\b');

        // these unary operators should not be used as property/method names
        var unaryOperatorsRE = new RegExp('\\b' + (
          'delete,typeof,void'
        ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

        // strip strings in expressions
        var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

        // detect problematic expressions in a template
        function detectErrors (ast, warn) {
          if (ast) {
            checkNode(ast, warn);
          }
        }

        function checkNode (node, warn) {
          if (node.type === 1) {
            for (var name in node.attrsMap) {
              if (dirRE.test(name)) {
                var value = node.attrsMap[name];
                if (value) {
                  var range = node.rawAttrsMap[name];
                  if (name === 'v-for') {
                    checkFor(node, ("v-for=\"" + value + "\""), warn, range);
                  } else if (name === 'v-slot' || name[0] === '#') {
                    checkFunctionParameterExpression(value, (name + "=\"" + value + "\""), warn, range);
                  } else if (onRE.test(name)) {
                    checkEvent(value, (name + "=\"" + value + "\""), warn, range);
                  } else {
                    checkExpression(value, (name + "=\"" + value + "\""), warn, range);
                  }
                }
              }
            }
            if (node.children) {
              for (var i = 0; i < node.children.length; i++) {
                checkNode(node.children[i], warn);
              }
            }
          } else if (node.type === 2) {
            checkExpression(node.expression, node.text, warn, node);
          }
        }

        function checkEvent (exp, text, warn, range) {
          var stripped = exp.replace(stripStringRE, '');
          var keywordMatch = stripped.match(unaryOperatorsRE);
          if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
            warn(
              "avoid using JavaScript unary operator as property name: " +
              "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
              range
            );
          }
          checkExpression(exp, text, warn, range);
        }

        function checkFor (node, text, warn, range) {
          checkExpression(node.for || '', text, warn, range);
          checkIdentifier(node.alias, 'v-for alias', text, warn, range);
          checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
          checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
        }

        function checkIdentifier (
          ident,
          type,
          text,
          warn,
          range
        ) {
          if (typeof ident === 'string') {
            try {
              new Function(("var " + ident + "=_"));
            } catch (e) {
              warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
            }
          }
        }

        function checkExpression (exp, text, warn, range) {
          try {
            new Function(("return " + exp));
          } catch (e) {
            var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
            if (keywordMatch) {
              warn(
                "avoid using JavaScript keyword as property name: " +
                "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
                range
              );
            } else {
              warn(
                "invalid expression: " + (e.message) + " in\n\n" +
                "    " + exp + "\n\n" +
                "  Raw expression: " + (text.trim()) + "\n",
                range
              );
            }
          }
        }

        function checkFunctionParameterExpression (exp, text, warn, range) {
          try {
            new Function(exp, '');
          } catch (e) {
            warn(
              "invalid function parameter expression: " + (e.message) + " in\n\n" +
              "    " + exp + "\n\n" +
              "  Raw expression: " + (text.trim()) + "\n",
              range
            );
          }
        }

        /*  */

        var range = 2;

        function generateCodeFrame (
          source,
          start,
          end
        ) {
          if (start === void 0) start = 0;
          if (end === void 0) end = source.length;

          var lines = source.split(/\r?\n/);
          var count = 0;
          var res = [];
          for (var i = 0; i < lines.length; i++) {
            count += lines[i].length + 1;
            if (count >= start) {
              for (var j = i - range; j <= i + range || end > count; j++) {
                if (j < 0 || j >= lines.length) { continue }
                res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
                var lineLength = lines[j].length;
                if (j === i) {
                  // push underline
                  var pad = start - (count - lineLength) + 1;
                  var length = end > count ? lineLength - pad : end - start;
                  res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
                } else if (j > i) {
                  if (end > count) {
                    var length$1 = Math.min(end - count, lineLength);
                    res.push("   |  " + repeat$1("^", length$1));
                  }
                  count += lineLength + 1;
                }
              }
              break
            }
          }
          return res.join('\n')
        }

        function repeat$1 (str, n) {
          var result = '';
          if (n > 0) {
            while (true) { // eslint-disable-line
              if (n & 1) { result += str; }
              n >>>= 1;
              if (n <= 0) { break }
              str += str;
            }
          }
          return result
        }

        /*  */



        function createFunction (code, errors) {
          try {
            return new Function(code)
          } catch (err) {
            errors.push({ err: err, code: code });
            return noop
          }
        }

        function createCompileToFunctionFn (compile) {
          var cache = Object.create(null);

          return function compileToFunctions (
            template,
            options,
            vm
          ) {
            options = extend({}, options);
            var warn$$1 = options.warn || warn;
            delete options.warn;

            /* istanbul ignore if */
            {
              // detect possible CSP restriction
              try {
                new Function('return 1');
              } catch (e) {
                if (e.toString().match(/unsafe-eval|CSP/)) {
                  warn$$1(
                    'It seems you are using the standalone build of Vue.js in an ' +
                    'environment with Content Security Policy that prohibits unsafe-eval. ' +
                    'The template compiler cannot work in this environment. Consider ' +
                    'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                    'templates into render functions.'
                  );
                }
              }
            }

            // check cache
            var key = options.delimiters
              ? String(options.delimiters) + template
              : template;
            if (cache[key]) {
              return cache[key]
            }

            // compile
            var compiled = compile(template, options);

            // check compilation errors/tips
            {
              if (compiled.errors && compiled.errors.length) {
                if (options.outputSourceRange) {
                  compiled.errors.forEach(function (e) {
                    warn$$1(
                      "Error compiling template:\n\n" + (e.msg) + "\n\n" +
                      generateCodeFrame(template, e.start, e.end),
                      vm
                    );
                  });
                } else {
                  warn$$1(
                    "Error compiling template:\n\n" + template + "\n\n" +
                    compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
                    vm
                  );
                }
              }
              if (compiled.tips && compiled.tips.length) {
                if (options.outputSourceRange) {
                  compiled.tips.forEach(function (e) { return tip(e.msg, vm); });
                } else {
                  compiled.tips.forEach(function (msg) { return tip(msg, vm); });
                }
              }
            }

            // turn code into functions
            var res = {};
            var fnGenErrors = [];
            res.render = createFunction(compiled.render, fnGenErrors);
            res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
              return createFunction(code, fnGenErrors)
            });

            // check function generation errors.
            // this should only happen if there is a bug in the compiler itself.
            // mostly for codegen development use
            /* istanbul ignore if */
            {
              if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                warn$$1(
                  "Failed to generate render function:\n\n" +
                  fnGenErrors.map(function (ref) {
                    var err = ref.err;
                    var code = ref.code;

                    return ((err.toString()) + " in\n\n" + code + "\n");
                  }).join('\n'),
                  vm
                );
              }
            }

            return (cache[key] = res)
          }
        }

        /*  */

        function createCompilerCreator (baseCompile) {
          return function createCompiler (baseOptions) {
            function compile (
              template,
              options
            ) {
              var finalOptions = Object.create(baseOptions);
              var errors = [];
              var tips = [];

              var warn = function (msg, range, tip) {
                (tip ? tips : errors).push(msg);
              };

              if (options) {
                if (options.outputSourceRange) {
                  // $flow-disable-line
                  var leadingSpaceLength = template.match(/^\s*/)[0].length;

                  warn = function (msg, range, tip) {
                    var data = { msg: msg };
                    if (range) {
                      if (range.start != null) {
                        data.start = range.start + leadingSpaceLength;
                      }
                      if (range.end != null) {
                        data.end = range.end + leadingSpaceLength;
                      }
                    }
                    (tip ? tips : errors).push(data);
                  };
                }
                // merge custom modules
                if (options.modules) {
                  finalOptions.modules =
                    (baseOptions.modules || []).concat(options.modules);
                }
                // merge custom directives
                if (options.directives) {
                  finalOptions.directives = extend(
                    Object.create(baseOptions.directives || null),
                    options.directives
                  );
                }
                // copy other options
                for (var key in options) {
                  if (key !== 'modules' && key !== 'directives') {
                    finalOptions[key] = options[key];
                  }
                }
              }

              finalOptions.warn = warn;

              var compiled = baseCompile(template.trim(), finalOptions);
              {
                detectErrors(compiled.ast, warn);
              }
              compiled.errors = errors;
              compiled.tips = tips;
              return compiled
            }

            return {
              compile: compile,
              compileToFunctions: createCompileToFunctionFn(compile)
            }
          }
        }

        /*  */

        // `createCompilerCreator` allows creating compilers that use alternative
        // parser/optimizer/codegen, e.g the SSR optimizing compiler.
        // Here we just export a default compiler using the default parts.
        var createCompiler = createCompilerCreator(function baseCompile (
          template,
          options
        ) {
          var ast = parse(template.trim(), options);
          if (options.optimize !== false) {
            optimize(ast, options);
          }
          var code = generate(ast, options);
          return {
            ast: ast,
            render: code.render,
            staticRenderFns: code.staticRenderFns
          }
        });

        /*  */

        var ref$1 = createCompiler(baseOptions);
        var compile = ref$1.compile;
        var compileToFunctions = ref$1.compileToFunctions;

        /*  */

        // check whether current browser encodes a char inside attribute values
        var div;
        function getShouldDecode (href) {
          div = div || document.createElement('div');
          div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
          return div.innerHTML.indexOf('&#10;') > 0
        }

        // #3663: IE encodes newlines inside attribute values while other browsers don't
        var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
        // #6828: chrome encodes content in a[href]
        var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;

        /*  */

        var idToTemplate = cached(function (id) {
          var el = query(id);
          return el && el.innerHTML
        });

        var mount = Vue.prototype.$mount;
        Vue.prototype.$mount = function (
          el,
          hydrating
        ) {
          el = el && query(el);

          /* istanbul ignore if */
          if (el === document.body || el === document.documentElement) {
            warn(
              "Do not mount Vue to <html> or <body> - mount to normal elements instead."
            );
            return this
          }

          var options = this.$options;
          // resolve template/el and convert to render function
          if (!options.render) {
            var template = options.template;
            if (template) {
              if (typeof template === 'string') {
                if (template.charAt(0) === '#') {
                  template = idToTemplate(template);
                  /* istanbul ignore if */
                  if (!template) {
                    warn(
                      ("Template element not found or is empty: " + (options.template)),
                      this
                    );
                  }
                }
              } else if (template.nodeType) {
                template = template.innerHTML;
              } else {
                {
                  warn('invalid template option:' + template, this);
                }
                return this
              }
            } else if (el) {
              template = getOuterHTML(el);
            }
            if (template) {
              /* istanbul ignore if */
              if (config.performance && mark) {
                mark('compile');
              }

              var ref = compileToFunctions(template, {
                outputSourceRange: "development" !== 'production',
                shouldDecodeNewlines: shouldDecodeNewlines,
                shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
                delimiters: options.delimiters,
                comments: options.comments
              }, this);
              var render = ref.render;
              var staticRenderFns = ref.staticRenderFns;
              options.render = render;
              options.staticRenderFns = staticRenderFns;

              /* istanbul ignore if */
              if (config.performance && mark) {
                mark('compile end');
                measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
              }
            }
          }
          return mount.call(this, el, hydrating)
        };

        /**
         * Get outerHTML of elements, taking care
         * of SVG elements in IE as well.
         */
        function getOuterHTML (el) {
          if (el.outerHTML) {
            return el.outerHTML
          } else {
            var container = document.createElement('div');
            container.appendChild(el.cloneNode(true));
            return container.innerHTML
          }
        }

        Vue.compile = compileToFunctions;

        return Vue;

      })
);
